AMD Gaffe Has AIBs Ship Radeon HD 6790 with Too Many ROPs

btarunr · Apr 8, 2011, 11:12 AM

A possible miscommunication between AMD and its foundry or board partners saw some, if not all partners ship AMD Radeon HD 6790 graphics cards with more ROPs enabled than specified. The HD 6790 SKU is originally specified to have 16 of the 32 ROPs on the 40 nm Barts GPU enabled, however, batches of GPUs shipped have 24 out of 32 ROPs enabled. While not a bad thing for the user at all (since the GPU ends up with more geometry crunching power at its disposal), it has AMD red faced, as it disturbs the product lineup.

The issue surfaced when GPU-Z started reading ROP count of our samples as 24, even as AMD press deck and subsequently the product page on AMD website mentioned HD 6790 ROP count as 16. We initially dismissed it as a GPU-Z bug, but as it turns out, HD 6790 indeed has 24 ROPs enabled, if GPU-Z reads so. An ROP (raster operations processor) handles a key part of the GPU's geometry rendering. ROPs process final shader output pixels and put them into memory. 24 ROPs theoretically gives these few HD 6790 cards 50% higher geometry processing power. This isn't the first time AMD fumbled with specifications. Some of the first AMD Radeon HD 4830 graphics cards shipped with 80 stream processors less than specification; more recently, some initial Radeon HD 6850 samples had all 1120 stream processors of Barts enabled. They're supposed to have 960. AMD said that it is investigating into the matter, and could make an official statement soon.

We have asked severals AIBs to test their production boards and they all have 24 ROPs so far.

Update: We have discussed this with AMD and it looks like this was our mistake and the cards really have 16 ROPs.

The register GPU-Z looks at to calculate the number of active ROPs indicates the number of disabled ROP units using set bits. For the case of HD 6790 two bits are set, which means two disabled units. The Barts GPU has a total of 32 ROPs in 8 units, which would leave us with 24 ROPs based on the register data: (8 [total ROPs] - 2 [disabled ROPs]) * 4 [pixels per clock per ROP] = 24.

If you look at the architecture diagram above (look for the thick black box or the red box), you can see that the shader units of the GPU are split into two shader arrays and the ROPs (yellow squares next to "L2 cache") are independent from these. In reality the ROPs are located inside these shader arrays, too. As a result "two deactivated ROPs" really means "two deactivated ROPs per shader array". So the correct shader count is (4 [ROPs per shader array] - 2 [disabled ROPs per shader array]) * 2 [shader arrays] * 4 [pixels per clock per ROP] = 16 !

Thank you AMD for clearing this up.

theJesus · Apr 8, 2011, 11:26 AM

That would suck if you got one with 24 ROPs, but needed to RMA it and they sent you the normal 16 ROP one instead.

btarunr · Apr 8, 2011, 11:28 AM

Now more people will buy HD 6790 in hopes of "getting what they're not supposed to get". Gotta love AMD's "accident marketing".

"Oops, some cards have too many ROPs, buy a card, and get lucky"

"Oops, some HD 6950 can be flash to HD 6970, get lucky"

"Oops, some dual-core/tri-core CPUs can be unlocked to quad-core, buy one, get lucky"

It doesn't take CIA to see a pattern.

Jonap_1st · Apr 8, 2011, 11:34 AM

good news or bad news?

btarunr · Apr 8, 2011, 11:37 AM

Quote:

Originally Posted by Jonap_1st

good news or bad news?

Mixed. It's good if you already have a 6790 or are going to get one and it turns out to have 24 ROPs. It's bad if you go on to buy a 6790 in hopes of getting 24 ROPs, and it has 16. AMD specifications say 16.

mtosev · Apr 8, 2011, 11:41 AM

I like. So which brands have 24 ROPs? someone pls make a list

Trackr · Apr 8, 2011, 11:42 AM

Quote:

Originally Posted by btarunr

Now more people will buy HD 6790 in hopes of "getting what they're not supposed to get". Gotta love AMD's "accident marketing".

"Oops, some cards have too many ROPs, buy a card, and get lucky"

"Oops, some HD 6950 can be flash to HD 6970, get lucky"

"Oops, some dual-core/tri-core CPUs can be unlocked to quad-core, buy one, get lucky"

It doesn't take CIA to see a pattern.

That's not true.

The HD 6950s have a 98.6% chance of unlocking, and the CPUs are known to unlock almost as well, albeit with more effort.

And we have no idea what percentage of HD 6790s have 24 ROPs.

It's more of a "Shh, this card can unlock, but don't tell anyone", rather than a "Hey kids, come try out our GPUs and see if you get lucky".

20mmrain · Apr 8, 2011, 11:46 AM

Quote:

Originally Posted by btarunr

Now more people will buy HD 6790 in hopes of "getting what they're not supposed to get". Gotta love AMD's "accident marketing".

"Oops, some cards have too many ROPs, buy a card, and get lucky"

"Oops, some HD 6950 can be flash to HD 6970, get lucky"

"Oops, some dual-core/tri-core CPUs can be unlocked to quad-core, buy one, get lucky"

It doesn't take CIA to see a pattern.

Thought the exact same thing!!!

slyfox2151 · Apr 8, 2011, 11:46 AM

Quote:

Originally Posted by Trackr

That's not true.

The HD 6950s have a 98.6% chance of unlocking, and the CPUs are known to unlock almost as well, albeit with more effort.

And we have no idea what percentage of HD 6790s have 24 ROPs.

It's more of a "Shh, this card can unlock, but don't tell anyone", rather than a "Hey kids, come try out our GPUs and see if you get lucky".

they dont unlock..... they come with 24 ROPS already enabled. i would assume most if not all of the first stock of cards will be like this.

where did you pull the 98.6% number?

there is definetly a pattern with AMD releasing stunts like this.

"slyfox notices wizzard reading this thread and waits for his words of wisdom with anticipation."

qubit · Apr 8, 2011, 11:54 AM

Yeah, I'm with those who think that this is some unofficial marketing tactic from AMD. I think it's excellent and wish nvidia would make "mistakes" like this too.

slyfox2151 · Apr 8, 2011, 12:00 PM

Quote:

Originally Posted by qubit

Yeah, I'm with those who think that this is some unofficial marketing tactic from AMD. I think it's excellent and wish nvidia would make "mistakes" like this too.

acidently 3 GPUs on the GTX 580 :P

oh i can dream.

95Viper · Apr 8, 2011, 12:01 PM

Quote:

Originally Posted by btarunr

Now more people will buy HD 6790 in hopes of "getting what they're not supposed to get". Gotta love AMD's "accident marketing".

"Oops, some cards have too many ROPs, buy a card, and get lucky"

"Oops, some HD 6950 can be flash to HD 6970, get lucky"

"Oops, some dual-core/tri-core CPUs can be unlocked to quad-core, buy one, get lucky"

It doesn't take CIA to see a pattern.

yep

This marketing scheme works for the lottery here.
By a ticket take a chance, you may hit a winner.
People, love to gamble on a chance at being the winner.
So, why not draw on that characteristic.
I got a 6950 that unlocked... I am a winner!

qubit · Apr 8, 2011, 12:02 PM

Quote:

Originally Posted by slyfox2151

acidently 3 GPUs on the GTX 580 :P

oh i can dream.

And 800W power consumption!

meirb111 · Apr 8, 2011, 12:11 PM

Quote:

Originally Posted by btarunr

Now more people will buy HD 6790 in hopes of "getting what they're not supposed to get". Gotta love AMD's "accident marketing".

"Oops, some cards have too many ROPs, buy a card, and get lucky"

"Oops, some HD 6950 can be flash to HD 6970, get lucky"

"Oops, some dual-core/tri-core CPUs can be unlocked to quad-core, buy one, get lucky"

It doesn't take CIA to see a pattern.

reminds me of joke about a man that find his wife with another man
the other man says it an accident i slipped and fell on her breast

CharlO · Apr 8, 2011, 12:28 PM

Please back up that bios!

AMD lucky marketing is the best one ever!

NC37 · Apr 8, 2011, 12:30 PM

AMD is turning into one of those Japanese anime ball machines. Never know which one you'll get..."Ooo come on 24 ROPS!! Aww just a stock model..."

Only thing missing is they don't come with scantily clad top heavy school girls...yet *hint* *hint*

Actually that would put new demand into the GPU market. Buy a new AMD GPU, get a special collectors edition Ruby action figure! She overclocks high kids!! Collect all and trade with your friends!!

Jonap_1st · Apr 8, 2011, 12:39 PM

Quote:

Originally Posted by btarunr

Mixed. It's good if you already have a 6790 or are going to get one and it turns out to have 24 ROPs. It's bad if you go on to buy a 6790 in hopes of getting 24 ROPs, and it has 16. AMD specifications say 16.

if AMD redesign it to "true" 16 ROPs , then it will be really bad news..

i'll stick my trust to reviewers.

W1zzard · Apr 8, 2011, 12:58 PM

Quote:

Originally Posted by CharlO

Please back up that bios!

the rop config is not controlled by bios on these cards, i already checked

unsmart · Apr 8, 2011, 01:11 PM

So if the first batch where all 24 then the reviews are all bunk, right

now thats marketing!!

mamisano · Apr 8, 2011, 01:11 PM

How much will performance suffer when the 16 ROP cards are released?

mdm-adph · Apr 8, 2011, 01:13 PM

Seems to be par for the course for AMD/ATI -- what I wonder is: has Nvidia ever done anything like this (since back in the GF 6800 days)?

Arrakis+9 · Apr 8, 2011, 01:19 PM

Quote:

Originally Posted by btarunr

Now more people will buy HD 6790 in hopes of "getting what they're not supposed to get". Gotta love AMD's "accident marketing".

"Oops, some cards have too many ROPs, buy a card, and get lucky"

"Oops, some HD 6950 can be flash to HD 6970, get lucky"

"Oops, some dual-core/tri-core CPUs can be unlocked to quad-core, buy one, get lucky"

It doesn't take CIA to see a pattern.

that certainly does work for them. much better than any of intel or nvidia's marketing

antuk15 · Apr 8, 2011, 01:40 PM

I thought AMD said that this core couldn't be 'Unlocked' like the 6950 can.

Looks like it might actually be possible on some cores.

theJesus · Apr 8, 2011, 01:42 PM

Quote:

Originally Posted by mdm-adph

Seems to be par for the course for AMD/ATI -- what I wonder is: has Nvidia ever done anything like this (since back in the GF 6800 days)?

I thought I remembered hearing about GTX 260s unlocking to GTX 265s or something similar. IDK, I could be totally wrong.

edit: Not the 260, but some 465s can go to 470 http://www.overclock.net/nvidia/7522...65-gtx470.html

W1zzard · Apr 8, 2011, 01:43 PM

Quote:

Originally Posted by antuk15

I thought AMD said that this core couldn't be 'Unlocked' like the 6950 can.

Looks like it might actually be possible on some cores.

no, there is no unlocking potential. you could downgrade the rops to 16 or less in theory making the card slower.

but going from 24 to 32 rops is not possible, those are properly locked in hardware

Apr 8, 2011, 11:12 AM	#1
btarunr Editor & Senior Moderator Join Date: Oct 2007 Location: Hyderabad, India Posts: 15,030 (7.23/day) Thanks: 790 Thanked 13,028 Times in 5,719 Posts System Specs	AMD Gaffe Has AIBs Ship Radeon HD 6790 with Too Many ROPs A possible miscommunication between AMD and its foundry or board partners saw some, if not all partners ship AMD Radeon HD 6790 graphics cards with more ROPs enabled than specified. The HD 6790 SKU is originally specified to have 16 of the 32 ROPs on the 40 nm Barts GPU enabled, however, batches of GPUs shipped have 24 out of 32 ROPs enabled. While not a bad thing for the user at all (since the GPU ends up with more geometry crunching power at its disposal), it has AMD red faced, as it disturbs the product lineup. The issue surfaced when GPU-Z started reading ROP count of our samples as 24, even as AMD press deck and subsequently the product page on AMD website mentioned HD 6790 ROP count as 16. We initially dismissed it as a GPU-Z bug, but as it turns out, HD 6790 indeed has 24 ROPs enabled, if GPU-Z reads so. An ROP (raster operations processor) handles a key part of the GPU's geometry rendering. ROPs process final shader output pixels and put them into memory. 24 ROPs theoretically gives these few HD 6790 cards 50% higher geometry processing power. This isn't the first time AMD fumbled with specifications. Some of the first AMD Radeon HD 4830 graphics cards shipped with 80 stream processors less than specification; more recently, some initial Radeon HD 6850 samples had all 1120 stream processors of Barts enabled. They're supposed to have 960. AMD said that it is investigating into the matter, and could make an official statement soon. We have asked severals AIBs to test their production boards and they all have 24 ROPs so far. Update: We have discussed this with AMD and it looks like this was our mistake and the cards really have 16 ROPs. The register GPU-Z looks at to calculate the number of active ROPs indicates the number of disabled ROP units using set bits. For the case of HD 6790 two bits are set, which means two disabled units. The Barts GPU has a total of 32 ROPs in 8 units, which would leave us with 24 ROPs based on the register data: (8 [total ROPs] - 2 [disabled ROPs]) * 4 [pixels per clock per ROP] = 24. If you look at the architecture diagram above (look for the thick black box or the red box), you can see that the shader units of the GPU are split into two shader arrays and the ROPs (yellow squares next to "L2 cache") are independent from these. In reality the ROPs are located inside these shader arrays, too. As a result "two deactivated ROPs" really means "two deactivated ROPs per shader array". So the correct shader count is (4 [ROPs per shader array] - 2 [disabled ROPs per shader array]) * 2 [shader arrays] * 4 [pixels per clock per ROP] = 16 ! Thank you AMD for clearing this up. Last edited by W1zzard; Apr 8, 2011 at 03:38 PM.

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Apr 8, 2011, 11:26 AM	#2
theJesus Join Date: Jul 2008 Location: Canton, Ohio Posts: 3,127 (1.74/day) Thanks: 2,308 Thanked 866 Times in 613 Posts System Specs	That would suck if you got one with 24 ROPs, but needed to RMA it and they sent you the normal 16 ROP one instead. __________________ HEAT “congratulations! you have successfully been inflicted with tpuitis! symptons include: prolonged computer usage, urge to make tpu your homepage, posting at rapid posts-per-day ratios (also known as post whoring), and the urge to waste lots of money on high end computer hardware that you dont need!” -panchoman “Modding to me is something best shared with others.... Kind of like a fine wine, but without the drunk driving arrest and hangovers.” -MKmods “i'm going to punch you in the face now Jesus..” -BumbleBee

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Apr 8, 2011, 11:28 AM	#3
btarunr Editor & Senior Moderator Join Date: Oct 2007 Location: Hyderabad, India Posts: 15,030 (7.23/day) Thanks: 790 Thanked 13,028 Times in 5,719 Posts System Specs	Now more people will buy HD 6790 in hopes of "getting what they're not supposed to get". Gotta love AMD's "accident marketing". "Oops, some cards have too many ROPs, buy a card, and get lucky" "Oops, some HD 6950 can be flash to HD 6970, get lucky" "Oops, some dual-core/tri-core CPUs can be unlocked to quad-core, buy one, get lucky" It doesn't take CIA to see a pattern. __________________ Gadgets, Gaming, Phones, Tablets, Cameras, TVs, HiFi...NextPowerUp

Apr 8, 2011, 11:34 AM	#4
Jonap_1st Join Date: Oct 2010 Location: South Green Jakarta Posts: 288 (0.30/day) Thanks: 20 Thanked 13 Times in 13 Posts System Specs	good news or bad news?

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Apr 8, 2011, 11:41 AM	#6
mtosev Join Date: Mar 2005 Location: Maribor, Slovenia Posts: 1,145 (0.38/day) Thanks: 72 Thanked 147 Times in 107 Posts System Specs	I like. So which brands have 24 ROPs? someone pls make a list __________________ My notebook: Dell Inspiron 1520 (6464) Intel Core 2 Duo (Merom) T7500, 2gb Hyundai 667MHz DDR2 CL5, 8600M GT 256Mb DDR2, 160Gb Seagate NCQ SATA, TSST DVD-RAM/+/-RW, PM/GM965 chipset [img disabled]http://img167.imageshack.us/img167/534/326cd7.gif[/IMG] CNN - "The Most Trusted Name in News"

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Apr 8, 2011, 11:54 AM	#10
qubit Overclocked quantum bit Join Date: Dec 2007 Location: Quantumville UK Posts: 8,719 (4.31/day) Thanks: 4,216 Thanked 3,334 Times in 1,970 Posts System Specs	Yeah, I'm with those who think that this is some unofficial marketing tactic from AMD. I think it's excellent and wish nvidia would make "mistakes" like this too. __________________ Siggie in the post.

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Apr 8, 2011, 12:28 PM	#15
CharlO Join Date: Oct 2008 Posts: 59 (0.03/day) Thanks: 13 Thanked 2 Times in 2 Posts	Please back up that bios! AMD lucky marketing is the best one ever! __________________ CharlO

Apr 8, 2011, 12:30 PM	#16
NC37 Join Date: Oct 2008 Location: The armpit of California Posts: 1,067 (0.63/day) Thanks: 156 Thanked 238 Times in 142 Posts System Specs	AMD is turning into one of those Japanese anime ball machines. Never know which one you'll get..."Ooo come on 24 ROPS!! Aww just a stock model..." Only thing missing is they don't come with scantily clad top heavy school girls...yet hint hint Actually that would put new demand into the GPU market. Buy a new AMD GPU, get a special collectors edition Ruby action figure! She overclocks high kids!! Collect all and trade with your friends!!

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Apr 8, 2011, 01:11 PM	#19
unsmart Join Date: Mar 2006 Posts: 397 (0.15/day) Thanks: 16 Thanked 38 Times in 37 Posts	So if the first batch where all 24 then the reviews are all bunk, right now thats marketing!! __________________ my optic flip top mod: http://forums.techpowerup.com/showthread.php?t=26851

Apr 8, 2011, 01:11 PM	#20
mamisano Join Date: Feb 2007 Posts: 45 (0.02/day) Thanks: 2 Thanked 5 Times in 3 Posts System Specs	How much will performance suffer when the 16 ROP cards are released?

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Apr 8, 2011, 01:13 PM	#21
mdm-adph Join Date: Mar 2007 Location: Your house. Posts: 2,426 (1.07/day) Thanks: 401 Thanked 344 Times in 247 Posts System Specs	Seems to be par for the course for AMD/ATI -- what I wonder is: has Nvidia ever done anything like this (since back in the GF 6800 days)? __________________ CPU-Z validation sig pics temporarily blocked

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Apr 8, 2011, 01:40 PM	#23
antuk15 Join Date: Feb 2011 Posts: 338 (0.40/day) Thanks: 7 Thanked 135 Times in 47 Posts System Specs	I thought AMD said that this core couldn't be 'Unlocked' like the 6950 can. Looks like it might actually be possible on some cores.

System Name:	AMD
Processor:	Phenom 2 x6 1075T @ 4.1Ghz
Motherboard:	ASUS Crosshair 4 Extreme
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Memory:	4Gb Kingston Hyper X 2000Mhz
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PSU:	Jeantech Absolute 1000w Modular

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