AMD Radeon HD 7900 ''Tahiti'' Pictured, 384-bit Memory Bus Confirmed?

btarunr · Dec 8, 2011, 04:39 PM

A Beyond3D forum member posted a mysterious picture of two graphics cards that could very well be engineering samples of AMD's true next-generation Radeon HD 7900 "Tahiti" graphics cards. The final products most probably won't look like these, with a bare red PCB, but it does look like the reference cooler design is ready. A more important feature in that picture is the spotting of traces for at least 11 memory chips, the 12th one (not highlighted) is apparently near the PCIe slot interface. The presence of 12 memory chips gives rumors of Tahiti featuring a 384-bit wide memory interface a shot in the arm. This will be the first AMD GPU in over 5 years to feature a memory bus wider than 256-bit. The R600 Radeon HD 2900 GPU featured a 512-bit GDDR4-capable memory interface.

Sources: Beyond3D Forums, VR-Zone

radrok · Dec 8, 2011, 04:42 PM

Oh god can't wait, give me 2 no no wait 3

robal · Dec 8, 2011, 04:43 PM

At last ! Some picture p0rn !

Volkszorn88 · Dec 8, 2011, 04:44 PM

stfu already and take my money

theoneandonlymrk · Dec 8, 2011, 04:46 PM

no disclosure on what its use is though damn

Aetherius · Dec 8, 2011, 04:50 PM

Cool! Im ready for these to release!!

btarunr · Dec 8, 2011, 04:53 PM

Let's play spot the 12th memory chip.

This?

BTW, that is a huge GPU package.

Zubasa · Dec 8, 2011, 04:55 PM

Quote:

Originally Posted by btarunr

BTW, that is a huge GPU package.

So is the GTX 580, and we know what a beast that is

LAN_deRf_HA · Dec 8, 2011, 04:57 PM

Is there anything about the solder points on the back of those chips that indicates whether or not it's GDDR5/XDR?

radrok · Dec 8, 2011, 05:01 PM

Also found this magnification

Super XP · Dec 8, 2011, 05:01 PM

From what I've found out they are going with GDDR5. Also it seems AMD has been pushing for DDR memory for some time now. Though XDR would have been interesting indead. Now for the questions? Do I wait for another HD 6970 and do CrossfireX or do I sell my HD 6970, add a few more $$ and go for the upcoming HD 7970

It all depends on Price/Performance

radrok · Dec 8, 2011, 05:03 PM

Quote:

Originally Posted by Super XP

From what I've found out they are going with GDDR5. Also it seems AMD has been pushing for DDR memory for some time now. Though XDR would have been interesting indead. Now for the questions? Do I wait for another HD 6970 and do CrossfireX or do I sell my HD 6970, add a few more $$ and go for the upcoming HD 7970

It all depends on Price/Performance

Just by experience, go for the newer series... AMD/ATI drivers have always been the best when using the latest gen cards

btarunr · Dec 8, 2011, 05:06 PM

Quote:

Originally Posted by LAN_deRf_HA

Is there anything about the solder points on the back of those chips that indicates whether or not it's GDDR5/XDR?

Looking at the picture radrok posted, those traces look GDDR5. That said, it is rumored that Tahiti will feature support for both GDDR5 and XDR2, but they'll need two different PCB designs for GDDR5 boards and XDR2 ones. They're nowhere near pin-compatible. So this has to be that GDDR5 board.

Although there's just a small possibility that Tahiti will support XDR2, looking at these pictures is no way of dismissing that possibility. We'll have to wait for the products to actually launch, or any pre-release info to kill that "Tahiti-XDR2" rumor.

robal · Dec 8, 2011, 05:06 PM

Quote:

Originally Posted by LAN_deRf_HA

Is there anything about the solder points on the back of those chips that indicates whether or not it's GDDR5/XDR?

I doubt it.

Especially that XDR2 controller is compatible with GDDR5.
That means, even if it is integrated in Tahiti die, memory interfaces will look identical. Even same memory packages, probably.

Cheers,

radrok · Dec 8, 2011, 05:08 PM

If I were from AMD I would honestly fear to have something to do with Rambus even though XDR2 would have been surely intriguing

Hayder_Master · Dec 8, 2011, 05:13 PM

At laaaaaaaaaast

cadaveca · Dec 8, 2011, 05:17 PM

Shit...maybe I'm totally off on what I'm expecting. How very interesting.

Sucks to see a red PCB, and dual 8-pin connectors though. 375W monster?

Quote:

Originally Posted by btarunr

Let's play spot the 12th memory chip.

This?
http://img.techpowerup.org/111208/bta4098dc.jpg

BTW, that is a huge GPU package.

What about the IOMMU that has been confirmed already? That could be used as teh "12th chip".

Shit. I was really expecting 128-bit IOMMU and 256-bit memory bus. Does GCN really need that much bandwidth? I'm so confused!!!

Super XP · Dec 8, 2011, 05:18 PM

Quote:

Originally Posted by radrok

If I were from AMD I would honestly fear to have something to do with Rambus even though XDR2 would have been surely intriguing

AMD can really benefit by using XDR2 memory. They just need to get some sort of aggreement in place so they cannot screw each other over. I mean RAMBUS can surely use the money and exposure by working with AMD.

Zubasa · Dec 8, 2011, 05:18 PM

Quote:

Originally Posted by radrok

If I were from AMD I would honestly fear to have something to do with Rambus even though XDR2 would have been surely intriguing

Guess what? Rambus has a hand in just about anything memory related.
Good luck avoiding them.

Super XP · Dec 8, 2011, 05:21 PM

Quote:

Originally Posted by cadaveca

Sucks to see a red PCB,

Let's keep ATI alive

btarunr · Dec 8, 2011, 05:21 PM

Quote:

Originally Posted by cadaveca

Sucks to see a red PCB

AMD high end card engineering samples (the ones made in Canada) have no backplate, and have red PCB. The mass production cards over the past two generations had black PCB and backplate.

Quote:

Originally Posted by cadaveca

What about the IOMMU that has been confirmed already? That could be used as teh "12th chip".

Shit. I was really expecting 128-bit IOMMU and 256-bit memory bus. Does GCN really need that much bandwidth? I'm so confused!!!

IOMMU can be integrated into the GPU die. It doesn't have to be a separate chip.

cadaveca · Dec 8, 2011, 05:29 PM

I understand that iommu doesn't need a chip. that was my point.

I've been talking about iommu for much longer than nearly anyone else. This has to be the most exciting thing about GCN for me. Most don't even have a clue what it'd be used for.

pantherx12 · Dec 8, 2011, 05:32 PM

Quote:

Originally Posted by cadaveca

Shit...maybe I'm totally off on what I'm expecting. How very interesting.

Sucks to see a red PCB, and dual 8-pin connectors though. 375W monster?

What about the IOMMU that has been confirmed already? That could be used as teh "12th chip".

Shit. I was really expecting 128-bit IOMMU and 256-bit memory bus. Does GCN really need that much bandwidth? I'm so confused!!!

It's 2 x 6 pin dude, although having said that the card underneath is 8 and 6.

X800 · Dec 8, 2011, 05:32 PM

I found this picture.

btarunr · Dec 8, 2011, 05:34 PM

Quote:

Originally Posted by X800

I found this picture.

Nice, so the missing chip (marked 1 in that picture) is right where we thought it would be.

Dec 8, 2011, 04:39 PM	#1
btarunr Editor & Senior Moderator Join Date: Oct 2007 Location: Hyderabad, India Posts: 14,981 (7.31/day) Thanks: 788 Thanked 12,895 Times in 5,647 Posts System Specs	AMD Radeon HD 7900 ''Tahiti'' Pictured, 384-bit Memory Bus Confirmed? A Beyond3D forum member posted a mysterious picture of two graphics cards that could very well be engineering samples of AMD's true next-generation Radeon HD 7900 "Tahiti" graphics cards. The final products most probably won't look like these, with a bare red PCB, but it does look like the reference cooler design is ready. A more important feature in that picture is the spotting of traces for at least 11 memory chips, the 12th one (not highlighted) is apparently near the PCIe slot interface. The presence of 12 memory chips gives rumors of Tahiti featuring a 384-bit wide memory interface a shot in the arm. This will be the first AMD GPU in over 5 years to feature a memory bus wider than 256-bit. The R600 Radeon HD 2900 GPU featured a 512-bit GDDR4-capable memory interface. Sources: Beyond3D Forums, VR-Zone

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Dec 8, 2011, 04:42 PM	#2
radrok Join Date: Oct 2011 Location: Italy Posts: 1,857 (3.26/day) Thanks: 137 Thanked 450 Times in 353 Posts System Specs	Oh god can't wait, give me 2 no no wait 3

Dec 8, 2011, 04:43 PM	#3
robal Join Date: Aug 2008 Location: Hampshire, UK Posts: 476 (0.27/day) Thanks: 24 Thanked 108 Times in 87 Posts System Specs	At last ! Some picture p0rn !

Dec 8, 2011, 04:44 PM	#4
Volkszorn88 Join Date: Jul 2010 Posts: 824 (0.79/day) Thanks: 112 Thanked 282 Times in 177 Posts System Specs	stfu already and take my money

Dec 8, 2011, 04:46 PM	#5
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Dec 8, 2011, 04:50 PM	#6
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Dec 8, 2011, 04:53 PM	#7
btarunr Editor & Senior Moderator Join Date: Oct 2007 Location: Hyderabad, India Posts: 14,981 (7.31/day) Thanks: 788 Thanked 12,895 Times in 5,647 Posts System Specs	Let's play spot the 12th memory chip. This? BTW, that is a huge GPU package. __________________ Gadgets, Phones, Tablets, Cameras, TVs, HiFi...NextPowerUp

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Dec 8, 2011, 04:57 PM	#9
LAN_deRf_HA Join Date: Apr 2008 Posts: 4,012 (2.14/day) Thanks: 289 Thanked 830 Times in 587 Posts System Specs	Is there anything about the solder points on the back of those chips that indicates whether or not it's GDDR5/XDR?

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Dec 8, 2011, 05:01 PM	#10
radrok Join Date: Oct 2011 Location: Italy Posts: 1,857 (3.26/day) Thanks: 137 Thanked 450 Times in 353 Posts System Specs	Also found this magnification

Dec 8, 2011, 05:01 PM	#11
Super XP Join Date: Mar 2005 Location: Ancient Greece, Acropolis Posts: 2,209 (0.74/day) Thanks: 1,204 Thanked 534 Times in 362 Posts System Specs	From what I've found out they are going with GDDR5. Also it seems AMD has been pushing for DDR memory for some time now. Though XDR would have been interesting indead. Now for the questions? Do I wait for another HD 6970 and do CrossfireX or do I sell my HD 6970, add a few more $$ and go for the upcoming HD 7970 It all depends on Price/Performance __________________

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Dec 8, 2011, 05:08 PM	#15
radrok Join Date: Oct 2011 Location: Italy Posts: 1,857 (3.26/day) Thanks: 137 Thanked 450 Times in 353 Posts System Specs	If I were from AMD I would honestly fear to have something to do with Rambus even though XDR2 would have been surely intriguing

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Dec 8, 2011, 05:29 PM	#22
cadaveca My name is Dave Join Date: Apr 2006 Location: The Great White North Posts: 10,766 (4.15/day) Thanks: 4,472 Thanked 5,184 Times in 3,196 Posts System Specs	I understand that iommu doesn't need a chip. that was my point. I've been talking about iommu for much longer than nearly anyone else. This has to be the most exciting thing about GCN for me. Most don't even have a clue what it'd be used for.

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Dec 8, 2011, 05:32 PM	#24
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