Introduction

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Today AMD announced their Radeon HD 4890 Series. It is based on the RV790 GPU which is an improved version of the RV770. The major cornerstone specifications have remained the same, only improvements related to clock frequencies have been made. While it was almost impossible to get an RV770 to run far beyond 800 MHz, the ATI HD 4890 reference runs at 850 MHz core by default. Many partners will be offering overclocked boards as well ranging up to 1000 MHz core speed.

We have three HD 4890 reviews for you today:
Powercolor HD 4890 (this review), Sapphire HD 4890 and AMD HD 4890 CrossFire. While AMD has been sending out overclocked cards running at 900 MHz, our cards are based on the reference design clocks of 850 MHz.

If you consider yourself a good artist, you may also want to check out our Create your own ATI high-end graphics card contest.

Please note that the PowerColor HD 4890 we are testing today has been pulled out of the stock of a german distributor which means it is guaranteed to not be a golden sample.

<table border="1" class="resulttable" cellspacing="0" cellpadding="3">
<tr>
<th></th>
<td>GeForce 
9800 GT</td>
<td>Radeon 
HD 4850</td>
<td>GeForce 
9800 GTX</td>
<td>GeForce GTS 
250 1 GB</td>
<td>GeForce 
GTX 260</td>
<td>Radeon 
HD 4870</td>
<td>Radeon 
HD 4890</td>
<td>GeForce 
GTX 275</td>
<td>GeForce 
GTX 280</td>
<td>Radeon 
HD 4870 X2</td>
<td>GeForce 
GTX 285</td>
</tr>
<tr>
<th>Shader units </th>
<td align="right">112</td>
<td align="right">800</td>
<td align="right">128</td>
<td align="right">128</td>
<td align="right">192</td>
<td align="right">800</td>
<td align="right">800</td>
<td align="right">240</td>
<td align="right">240</td>
<td align="right">2x 800</td>
<td align="right">240</td>
</tr>
<tr>
<th>ROPs</th>
<td align="right">16</td>
<td align="right">16</td>
<td align="right">16</td>
<td align="right">16</td>
<td align="right">28</td>
<td align="right">16</td>
<td align="right">16</td>
<td align="right">32</td>
<td align="right">32</td>
<td align="right">2x 16</td>
<td align="right">32</td>
</tr>
<tr>
<th>GPU</th>
<td align="right">G92</td>
<td align="right">RV770</td>
<td align="right">G92</td>
<td align="right">G92</td>
<td align="right">GT200</td>
<td align="right">RV770</td>
<td align="right">RV790</td>
<td align="right">GT200</td>
<td align="right">GT200</td>
<td align="right">2x RV770</td>
<td align="right">GT200b</td>
</tr>
<tr>
<th>Transistors</th>
<td align="right">754M </td>
<td align="right">956M</td>
<td align="right">754M </td>
<td align="right">754M </td>
<td align="right">1400M </td>
<td align="right">956M</td>
<td align="right">959M</td>
<td align="right">1400M </td>
<td align="right">1400M </td>
<td align="right">2x 956M</td>
<td align="right">1400M</td>
</tr>
<tr>
<th>Memory Size</th>
<td align="right">512 MB </td>
<td align="right">512 MB </td>
<td align="right">512 MB</td>
<td align="right">1024 MB</td>
<td align="right">896 MB</td>
<td align="right">512 MB </td>
<td align="right">1024 MB </td>
<td align="right">896 MB</td>
<td align="right">1024 MB</td>
<td align="right">2x 1024 MB </td>
<td align="right">1024 MB</td>
</tr>
<tr>
<th>Memory Bus Width </th>
<td align="right">256 bit </td>
<td align="right">256 bit </td>
<td align="right">256 bit </td>
<td align="right">256 bit </td>
<td align="right">448 bit </td>
<td align="right">256 bit </td>
<td align="right">256 bit </td>
<td align="right">448 bit </td>
<td align="right">512 bit </td>
<td align="right">2x 256 bit </td>
<td align="right">512 bit </td>
</tr>
<tr>
<th>Core Clock</th>
<td align="right">600 MHz </td>
<td align="right">625 MHz </td>
<td align="right">675 MHz </td>
<td align="right">738 MHz </td>
<td align="right">576 MHz </td>
<td align="right">750 MHz </td>
<td align="right">850 MHz </td>
<td align="right">633 MHz </td>
<td align="right">602 MHz </td>
<td align="right">750 MHz </td>
<td align="right">648 MHz </td>
</tr>
<tr>
<th>Memory Clock</th>
<td align="right">900 MHz </td>
<td align="right">993 MHz </td>
<td align="right">1100 MHz </td>
<td align="right">1100 MHz </td>
<td align="right">999 MHz </td>
<td align="right">900 MHz </td>
<td align="right">975 MHz </td>
<td align="right">1134 MHz </td>
<td align="right">1107 MHz </td>
<td align="right">900 MHz </td>
<td align="right">1242 MHz </td>
</tr>
<tr>
<th>Price</th>
<td align="right">$110</td>
<td align="right">$140</td>
<td align="right">$160</td>
<td align="right">$149</td>
<td align="right">$240</td>
<td align="right">$190</td>
<td align="right">$249</td>
<td align="right">$249</td>
<td align="right">$315</td>
<td align="right">$425</td>
<td align="right">$350</td>
</tr>
</table>

Packaging & Contents

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PowerColor uses their well established package for the HD 4890. Actually the box looks very similar to the HD 4870 package, a bit too close in my opinion.

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You will receive:

Graphics card
Documentation + Driver CD
CrossFire bridge
DVI Adapter + HDMI Adapter
TV out Adapter + Cables

The Card

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Powercolor uses the AMD reference design PCB and cooler. Only the sticker lets you identify the card as a PowerColor variant. As expected the card uses two slots in your system for optimum cooling of the card.

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The card has two DVI ports, the most common output configuration today. If you want to use the card with your big TV screen you can use the included HDMI adapter. In case you need an analog port you can also use the included DVI adapter.
For HDMI Audio, NVIDIA requires you to feed an external audio source, for example from your motherboard's on-board audio, to the card via SPDIF cable. AMD on the other hand has integrated a sound device inside their GPUs which is the easier solution for most users.

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The HD 4890 supports double, triple and quad CrossFire configurations for improved performance or better image quality.

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Here are the front and the back of the card, high-res versions are also available (front, back). If you choose to use these images for voltmods etc, please include a link back to this site or let us post your article.

A Closer Look

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AMD's HD 4890 cooler is very similar to that of the HD 4870. It uses a copper base plate that is connected to a bigger heatsink via heatpipes. The fan design exhausts hot air outside of the case.

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Two six pin power connectors are present on the reference design. Both are required for operation of the card.

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The GDDR5 memory chips are made by Qimonda and carry the model number IDGV1G-05A1F1C-40X. With a cycle time of 1.0 ns, they are specified to run at 1000 MHz.

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AMD has put two VT1165 voltage controllers on their cards. One is responsible for the VGPU core voltage and the second one controls the memory voltage. This is very nice for overclockers because they can now change both voltages via software. For the average joe, it is a production cost increase that seems quite unnecessary.

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This is AMD's new RV790 GPU. It is made in a 55 nm process at TSMC Taiwan with 959 million transistors. Please note that the die size is slightly increased from the RV770, the exact reason for that is unknown.

Test System

<table border="1" cellpadding="3" cellspacing="0" class="ramtable" width="450">
<tr align="center">
<th colspan="2" scope="row" style="font-size:larger;text-align:center">Test System</th>
</tr>
<tr>
<th width="150" scope="row">CPU:</th>
<td scope="row">Intel Core i7 920 @ 3.8 GHz (Bloomfield, 8192 KB Cache)</td>
</tr>
<tr>
<th scope="row">Motherboard:</th>
<td scope="row">Gigabyte X58 Extreme Intel X58 Kindly supplied by Gigabyte</td>
</tr>
<tr>
<th scope="row">Memory:</th>
<td scope="row">2x 1024MB OCZ DDR3 Platinum @ 1140 MHz 6-6-6-19</td>
</tr>
<tr>
<th valign="top" scope="row">Harddisk:</th>
<td valign="top" scope="row">WD Raptor 740ADFD 74 GB</td>
</tr>
<tr>
<th valign="top" scope="row">Power Supply:</th>
<td valign="top" scope="row">BFG ES-800 800W</td>
</tr>
<tr>
<th valign="top" scope="row">Software:</th>
<td valign="top" scope="row">Windows Vista SP1</td>
</tr>
<tr>
<th valign="top" scope="row">Drivers:</th>
<td valign="top" scope="row">NVIDIA: ForceWare 181.20, GTS 250: 182.06, GTX 275: 185.63 ATI: Catalyst 9.1, HD 4890: 8.592.1</td>
</tr>
</table>

All video card results were obtained on this exact system with the exact same configuration.
All games were set to their highest quality setting

Each benchmark was tested at the following settings and resolution:

1024 x 768, No Anti-aliasing, No anisotropic filtering. This is a standard resolution without demanding display settings.
1280 x 1024, 2x Anti-aliasing, 8x anisotropic filtering. Common resolution for most smaller flatscreens today (17" - 19"). A bit of eye candy turned on in the drivers.
1680 x 1050, 4x Anti-aliasing, 16x anisotropic filter. Most common widescreen resolution on larger displays (19" - 22"). Very good looking driver graphics settings.
1920 x 1200, 4x Anti-aliasing, 16x anisotropic filter. Typical widescreen resolution for large displays (22" - 26"). Very good looking driver graphics settings.

Call of Duty 4

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Call of Duty 4 is a first-person shooter that is built on the award winning Call of Duty Series. It is the first version to play in modern times. In a near-future conflict between the United States, Europe and Russia you get to play as a United States Marine and a British SAS operative. The engine is Infinity Ward's own creation and has true dynamic lighting, depth of field, dynamic shadows and HDR. Even though the game plot is scripted you will find yourself in intense battles, often working together with computer controlled team mates.

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Call of Juarez

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Call of Juarez was one of the first DX10 titles available on the market, that's why it was heavily used to demonstrate the benefits of DirectX 10. It runs on the Chrome Engine created by the polish game studio Techland. This first-person shooter game is set in a Wild West theme with the plot unfolding from the perspective of two characters: Billy and Reverend Ray. Each offers a different play style to keep the game interesting. Also included in the game is a "Concentration Mode" which slows down time in hectic situations - a feature first pioneered by the Max Payne Series.

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Company Of Heroes

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The real-time strategy game Company of Heroes is set during World War II where you take two American companies through several fights all over France to liberate the country from German occupation. Company of Heroes is the first game to use Relic's next-generation engine "Essence Engine" which includes support for HDR lighting, Shader Model 3.0, normal mapping, dynamic lighting and shadows. You are able to zoom in from the tactical view of the battle field to see the individual units fighting. Often you catch yourself admiring the detailed animations of the soldiers while the fight around you is raging.

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Crysis

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After the tremendous success of Far Cry, the German game studio Crytek released their latest shooter Crysis in 2007. The game was by far the most hyped and anticipated game in 2007, the forums were full of "Can my system run Crysis?" threads because of the high hardware requirements of this game. Just like in Far Cry the plot evolves on a small island with a thick and richly detailed jungle world. A lot of attention has been given to small details like correct physics. For example when you fire on a tree trunk, it will shatter and the tree will fall over leaving a stump behind. Enemies in a car can be stopped by shooting the tire of the car. The game graphics are by far the best ever seen in a PC game so far, yet the game still runs well on most computers.

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Enemy Territory: Quake Wars

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The first-person shooter Enemy Territory: Quake Wars is set in the science-fiction universe of Quake and requires several classes to work together to achieve certain goals on a map. In the campaign mode you gain experience which you can use to buy upgrades for your class. The player gets to pick from five classes of either the Global Defense Force or the Strogg faction. As underlying game engine, the successful id Software Doom 3 engine has been licensed, but several features like MegaTextures have been added, giving the outdoor world a much more detailed appearance.

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Far Cry

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Far Cry was released in early 2004 by the new development studio Crytek. It quickly became a massive success because it was one of the first titles to take you in a beautiful 3D outdoor world. Far Cry was one of the most demanding games at its time. Even with today's video cards you can still see big differences in frame rates, especially at the higher resolutions.

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Far Cry 2

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Four years after the success of Far Cry, Ubisoft has published the sequel called Far Cry 2. While the first part was set on an island, Far Cry 2 takes you deep into Africa with game play that resembles Grand Theft Auto much more than the original Far Cry, which was a classical 3D shooter. Ubisoft engineered a completely new 3D engine called "Dunia" which offers a large amount of popular features like DirectX 9 and DirectX 10 support, destructible environments, physics and non-scripted AI while not being as much of a resource hog as Crytek's CryEngine.

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FEAR

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The first person shooter F.E.A.R, developed by Monolith Game Studios, was released in Fall 2005 and has a great 3D engine that uses a large number of shading and shadow effects to accurately model the game world. In addition to that it features a realistic physics engine that lets you interact with many objects in the game world. The game was voted game of the year by several publications.

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Left 4 Dead

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Valve's Left 4 Dead is a first person shooter game that offers cooperative elements in both single and multiplayer. You and your team of three buddies end up in a nightmare full of raging zombies - hordes of them. L4D is based on the latest version of Valve's Source Engine which has been used in titles like Counter-Strike: Source and Team Fortress 2 before. There are several incremental improvements in the engine like self shadowing, better fog and lighting effects and post-effect shaders that add to the immersion effect.

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Prey

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Prey is based on a highly modified 3D engine made by id Software. This first person shooter brought a completely new way of gaming to the genre. In many levels you find yourself walking upside down or on the walls. This adds a completely new aspect to the gaming experience in this genre.

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Quake 4

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The Quake titles are among the most successful first person games. Developed by id Software, the famous game studio that brought you DOOM, you find yourself in a sci-fi world that is full of aliens and shocking effects. The main focus of the game is the single player story line. Quake 4 puts you on the home planet of the Strogg. In a number of missions you and your fellow marines will encounter all sorts of enemies, including some really huge aliens.

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Splinter Cell 3: Chaos Theory

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The Splinter Cell Series is endorsed by popular book author Tom Clancy. In the 2005 title Splinter Cell 3: Chaos Theory you play the NSA agent Sam Fisher who has to use stealth and finesse to make his way through a number of levels mainly set in eastern Asia. The game is based on a modified Unreal 2 engine with support for HDR, normal mapping, parallax mapping and soft shadows. A patch added Shader Model 2.0 support for ATI in addition to the Shader Model 3.0 support which was already part of the original shipping game.

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S.T.A.L.K.E.R.

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Before its release in 2007, S.T.A.L.K.E.R.: Shadow of Chernobyl was one of the most hyped games of the last years. This RPG/FPS hybrid game is set a few years in the future, after a nuclear disaster occurs at the Chernobyl Nuclear Power Plant. The release of radiation causes strange things like mutations in the nearby area. You take the role of a Stalker who seeks fame and riches in the contaminated area around Chernobyl. The game engine features all the latest buzzwords like HDR, bullet physics, skeletal animation, soft shadows and weather effects. Stalker's vast outside world is richly modeled, you can interact with a large number of objects in the game thanks to the physics engine.

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S.T.A.L.K.E.R. - Clear Sky

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STALKER Clear Sky is GSC Gameworld's prequel to the 2007 hit "STALKER". Just like in the first part the game is set around the Russian area of Chernobyl and Pripyat, most well known for the nuclear accident that occurred there. You play the role of a mercenary who spends his days in The Zone trying to make a living. The Zone is an area which is affected by so-called anomalies which cause mutants to appear and laws of physics to change. While you investigate these anomalies the plot leads up to the events that happened right before the first game starts. A new in-game faction system encourages you to befriend various groups in The Zone in exchange for information or items. While the graphics of Clear Sky are based on the first Stalker game engine, there are numerous improvements, including support for DirectX10 and depth-of-field/volumetric effects.

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Team Fortress 2

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Team Fortress 2 by the famous people from Valve software builds on an improved Half-Life 2 engine to deliver an action packed, team oriented, comic graphics first person shooter game. Even though the game features nice graphics, it tends to be very CPU limited, especially on lower resolutions. Players get to team up being either RED or BLU with a selection of nine classes. Each class offers a different play style, just like in the original Team Fortress games.

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Unreal Tournament 3

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The fourth game in Epic's highly successful Unreal Tournament Series is simply called Unreal Tournament 3. It is based on the all-new Unreal 3 engine which is a major step forward from the previous engine. The game principle is centered about an arena style gameplay where several contestants try to reach a certain kill count or capture a flag for example. As you would expect from a new 2007 title, the graphics are top notch, with large and detailed textures. One major drawback of the way the engine is designed is that there is no support for Anti-Aliasing.

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World In Conflict

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The realtime strategy game World In Conflict by Massive Entertainment is set in 1989 taking the player through a fictional conflict during the collapse of the Soviet Union. Unlike other RTS games, World in Conflict is not centered around building a base, you command units on the battlefield with a number of reinforcement points available to replace lost troops.
Massive's Masstech Game Engine makes heavy use of level-of-detail techniques which allow you to zoom in closely on the action displaying fights in high-fidelity with a large number of effects.

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Folding@home

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GPU accelerated computing is the latest trend to speed up computationally intense applications. One of the first projects to implement such a GPGPU method is Folding@home. Participants install a small program on their computer, the "Folding Client", which downloads work units from a server to be processed on the system.
In the past folding has been performed on on the CPU. Recently new clients have been developed for Folding on PlayStation 3, ATI and NVIDIA CUDA.

We used version 6.20r1 to download a work unit and fold it using whatever GPU acceleration is available. Due to the different GPU designs, different types of work unit were used. However, for most Folding users the PPD (Points Per Day) metric is the most important because that's what determines their ranking in the system.

Please note that we will not start multiple client instances. If a manufacturer chooses to implement native support for multiple GPUs, our client will benefit from that however. For comparison: a PlayStation 3 gets about 900 PPD, a Core 2 Duo E8400 about 550 PPD per processor core.

If you want to join the good cause, use team number 50711, which is TechPowerUps own Folding Team.

I encountered major difficulties using the reviewer's driver with Folding@Home. Either the "[Folding] core encountered an internal error" or there were some DLLs missing. I am sure that AMD or Stanford will address this problem in a future version.

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3DMark03

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Futuremark Corporation is the number one player in the world of synthetic benchmarking. The 3DMark series is the most popular test suite for video card testing and is used by gamers, overclockers and manufacturers alike to determine how fast their hardware is. Even though it is a few years old, 3DMark03 can easily stress today's video cards.

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3DMark05

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Another benchmark from Futuremark is 3DMark05 which comes with four completely new game tests that make massive use of shaders and lighting effects. 3DMark05 is a great test for modern video card architectures - in some tests you are often close to the 30 fps mark, below which your games will feel sluggish.

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3DMark06

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Even though it's based on Futuremark's 3DMark05, the new 3DMark06 adds new tests for Shader Model 3.0 and HDR rendering. It is also the first 3DMark to incorporate a CPU score into the final 3DMark score. All tests have received an overhaul, for example in the Canyon Flight test you can now see beautiful sun glare effects with the help of High Dynamic Range rendering.

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Power Consumption

Cooling modern video cards is becoming more and more difficult, especially when users are asking for quiet cooling solutions. That's why the engineers are now paying much more attention to power consumption of new video card designs.

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<tr align="center">
<th colspan="2" scope="row" style="font-size:larger;text-align:center">Test System</th>
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<tr>
<th width="150" scope="row">CPU:</th>
<td scope="row">Intel Core i7 920 @ 3.8 GHz (Bloomfield, 8192 KB Cache)</td>
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<th scope="row">Motherboard:</th>
<td scope="row">Gigabyte X58 Extreme Intel X58 Kindly supplied by Gigabyte</td>
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<th scope="row">Memory:</th>
<td scope="row">2x 1024MB OCZ DDR3 Platinum @ 1140 MHz 6-6-6-19</td>
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<th valign="top" scope="row">Harddisk:</th>
<td valign="top" scope="row">WD Raptor 740ADFD 74 GB</td>
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<th valign="top" scope="row">Power Supply:</th>
<td valign="top" scope="row">BFG ES-800 800W</td>
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<th valign="top" scope="row">Software:</th>
<td valign="top" scope="row">Windows Vista SP1</td>
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In order to characterize a video card's power consumption, the whole system's mains power draw was measured. This means that these numbers include CPU, Memory, HDD, Video card and PSU inefficiency.

The three result values are as following:

Idle: Windows sitting at the desktop (1024x768 32-bit) all windows closed, drivers installed.
Average: 3DMark03 Nature at 1280x1024, 6xAA, 16xAF. This results in the highest power consumption. Average of all readings (two per second) while the test was rendering (no title screen).
Peak: 3DMark03 Nature at 1280x1024, 6xAA, 16xAF. This results in the highest power consumption. Highest single reading

Even though ATI has implemented a 2D/3D clock switching model, the power consumption in idle is still quite high. One reason for that is that only the core frequency is reduced, while memory keeps running at full speed for the whole time. During testing I noticed that any memory frequency change will make the screen display flicker, which is probably the reason why AMD chose not to allow dynamic memory clock changes.

Under load the card reaches more acceptable power consumption levels which are in line with what an overclocked RV770 would consume.

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Fan Noise

In the past years users would accept everything just to get more performance. Nowadays this has changed with people being more aware of the fan noise and power consumption of their graphic cards.
In order to properly test the fan noise a card emits we are using a Bruel & Kjaer 2236 sound level meter (~$4,000) which has the measurement range and accuracy we are looking for.

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The tested graphics card is installed in a system that is completely passively cooled. That is passive PSU, passive CPU cooler, passive cooling on the motherboard and Solid-State HDD.
This setup allows us to eliminate secondary noise sources and test only the video card. To be more compliant with standards like DIN 45635 (we are not claiming to be fully DIN 45635 certified) the measurement is conducted at 100 cm distance and 160 cm over the floor. The ambient background noise level in the room is well below 20 dbA for all measurements. Please note that the dbA scale is not linear, it is logarithmic. 40 dbA is not twice as loud as 20 dbA. A 3 dbA increase results in double the sound pressure. The human hearing is a bit different and it is generally accepted that a 10 dbA increase doubles the perceived sound level.

All the performance improvements have resulted fairly noisy card under both idle and load. Especially under load the fan ramps up to be extremely noisy. Our second HD 4890 sample shows similar noise levels so the cooler is not broken. I hope that AIBs will address this issue quickly in their custom versions.

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Performance Summary

To create this graph we took all performance results of the four resolutions we tested, threw them together and calculated the relative performance of each card, compared to our review sample. In a fifth graph we also combined all tests in all resolutions to calculate the total relative performance of the review sample.

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Performance per Watt

This graph was created by taking the relative performance numbers and putting them in contrast to the average power consumption results. To offset power consumption of the rest of the system we subtracted 150 W from the average consumption.

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Performance per Dollar

If you are looking for the best bang for the buck, then you will love this graph. We looked up the current USD price of each card on the popular online shop Newegg and used it and the relative performance numbers to calculate the Performance per Dollar Index.

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Overclocking

To find the maximum overclock of our card we used a combination of ATITool's successor and our benchmarking suite.
The overclocks listed here were achieved with the default fan and voltage settings as defined in the VGA BIOS. Please note that every single sample overclocks differently, that's why our results here can only serve as a guideline for what you can expect from your card.

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The final overclocks of our card are 880 MHz core (4% overclock) and 1120 MHz Memory (15% overclock). AMD has been promising that a large portion of HD 4890 cards will be able to hit 900 to 950 MHz, apparently we didn't get lucky with our samples. The Powercolor card tested here managed 880 MHz and our second card from Sapphire managed 925 MHz.

Overclocked Performance

Using these clock frequencies we ran a quick test of Call of Duty 4 to evaluate the gains from overclocking.

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The actual 3D performance gained is 4.0%.

Temperatures

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Temperatures are in a perfectly safe range, I would have wished for less fan noise and slightly higher temperatures though.

Value and Conclusion

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The initial price point of the HD 4890 is $249. But I expect a lot of price drops, just like we saw on the previous RV770 based products. According to AMD a $20 mail in rebate is available for all HD 4890 cards which will bring the price down to $229.

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Very solid performance increase over HD 4870
1 GB of memory
Dual voltage controllers make voltmods obsolete
Cooler blows hot air out of the case

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Noisy
Limited overclocking (on our sample)
No architectural improvements
No support for CUDA / PhysX

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<tr><th>9.0</th>
<td>AMD's HD 4890 Series is a solid upgrade from the HD 4870. In our testing we see a performance increase of 13% when averaged over all benchmarks and all resolutions. Considering the core clock increase is 13.3% from the HD 4870, I see the theories confirmed that predicted the RV770 to be a clock scaling wonder. 
It is sad that whoever chose the fan speed settings of the HD 4890 must have been deaf. The card is very noisy in both idle and load, despite running at comfortable temperatures. We have tested a HD 4870 to emit 32.5 dbA under load, the HD 4890 is 43.3 dbA. A 10 dbA increase is generally accepted as double the perceived fan noise. So why is the card twice as load? It's not twice as fast nor does it consume twice the power. 
AMD has been working on the HD 4890 pricing until a few hours ago. The latest information we received them was that the card will cost $229 after a $20 mail in rebate. At this price the HD 4890 can't compete with the GTX 275 when it comes to performance per dollar. AMD has been praising the overclockability of their RV790, but it seems we were unlucky with the cards we received. My guess is that an aggressive binning strategy put the best overclocking ASICs on the press samples that AMD sent out.
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