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AMD ''Barts'' GPU Detailed Specifications Surface

btarunr

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#1
Barely a week after pictures of AMD's "Barts" prototype surfaced, it wasn't long before a specifications sheet followed. The all-important slide from AMD's presentation to its add-in board partners made it to sections of the Chinese media. "Barts" is a successor to "Juniper", on which are based the Radeon HD 5750 and HD 5770. The specs sheet reveals that while indeed the GPU looks to be larger physically, there are other factors that make it big:

Memory Controller
Barts has a 256-bit wide memory interface, which significantly increases its pin-count, and package-size. The "Pro" and "XT" variants (which will go on to be HD 6x50 and HD 6x70, respectively), have memory clocked at 1000 MHz and 1200 MHz, respectively, so that's nearly 100% increase in memory bandwidth .

Tiny increase in SIMD count, but major restructuring
Compared to Juniper, there seems to be an increase of only 20% in stream processor count physically. The XT variant has 960 stream processors, while the Pro variant has 800. AMD specifically mentioned SIMD block count, (10 enabled for Pro, 12 enabled for XT). If you noticed the slide, it says that the GPU is based on the "Cypress Dual Engine architecture", meaning that these 10 and 12 SIMD units will be spread across two blocks of 5 (Pro) or 6 (XT) SIMDs each, just like Cypress had two blocks of 10 SIMDs each.

Other components
The Raster Operations unit (ROP) count has been doubled to 32, TMUs stand at 40 for the Pro and 48 for the XT.

The design methodology is extremely simple. Juniper-based graphics cards anyway carry 8 memory chips to meet up to memory amount requirements of 1 GB using market-popular 1 Gbit GDDR5 chips, so why not just place those 8 chips across a 256-bit wide memory interface and double the memory bandwidth. The increased ROP count, coupled with up to 20% increase in shader compute power gives Barts the competitive edge it needs to face NVIDIA's reinvigorated GeForce 400 series after the introduction of the GeForce GTX 460. As for power draw, AMD projects the Pro variant to draw less than 150W, with the XT drawing "over" 150W.

Market Positioning
AMD doesn't have huge expectations from this. It has its task cut out: to compete with the GeForce GTX 460 768 MB and 1 GB models. While memory count ROP made the cut out NVIDIA's variants, AMD's come from clock speeds and SIMD core counts. It should then become obvious what these GPUs' pricing should look like.

When?
Usually when AMD gives out such a presentation to its AIB partners, a market release is about 3 months away.



Source: ChipHell
 
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#2
Wow that's really sweet :)
 
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#3
Nice ... hope the prices will be decent ... :)
 

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#4
At least this time AMD is not "sponsoring" game developers to integrate dx999 in future games , and maybe , just maybe we will see some cheaper cards . Looking forward to hd6000 . Go AMD ! MY 260gtx`s are getting old :(
 

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#5
im hoping it will be pricewise around those of the current 5770 unless its scratching 5850 performance. im afraid we will see 4890 performance( a small notch above the 5770 ) and cost 230 dollar. while i paid 190 for my 4890 a year ago.
 
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#6
This should beat the GF104 pretty bad otherwise nvidia is going to leapfrog them early 2011. I think AMD wants a very good next year before it goes to NI and the new fab process. If the green side doesn't have anything special up their sleeves its not going to be very hard for them.
 
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#7
I don't know. I have mixed feelings about this move from AMD. The increase in die size will bring more heat, but I don't see them changing the cooling specs so these will just run hotter and eat more power. I complete understand the move and why the decided to mark these as 6000 series (as per their own naming rules put in place during the 3000 era), but I don't think this will help their position much. Lowering the price of the 5770 and 5830 seemed like a better move to me so they can spend the development time/money for these new 5000++ chips on building a better weapon. They also seem to be using this to avoid dual chip variants that historically have sold poorly and created a lot of heat related failures (Only Exception being the King of Gaming GPU's as I call them in the $500+ range from both camps).

I just think it would have made more sense to make only one of these, call it the 5790 (the 960 version), put it in the price range between the GTX 460 and GTX 465, and then discontinue the 5830.
 
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#8
Dreams of 6870(or whatever it will be called) spec.

512 bit gddr5 at 1600mhz (6400mhz effective) 64 rop's and 96 tmu's and 1920 stream processors and 1000mhz core speed would be a beautiful card
 

cadaveca

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#9
WOAH.


:eek:



If....if this is 5770 replacement....


Then 5870 replacement is 1920 shaders !?!


:wtf:


3 months...November 17th retail? March 23rd for 6870, with BullDozer-based desktop chips, April retail, to coincide with Duke Nukem launch?:D



:laugh:
 
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#10
depending on how amd reengineered the sp's this thing could be faster than the 5850

damn the 6870 could be a monster, makes me wonder if this is NI or SI


"wonders if its fake"
 

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#11
Dreams of 6870(or whatever it will be called) spec.

512 bit gddr5 at 1600mhz (6400mhz effective) 64 rop's and 96 tmu's and 1920 stream processors and 1000mhz core speed would be a beautiful card
I think you live in a dream world, but one can only hope right.
 
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#12
I think you live in a dream world, but one can only hope right.

:laugh: dam straight im in a dream world, first off i woudl expect another 850mhz core speed, i think 512bit may be possible with current speed gddr5 or a 256bit with super fast gddr5 (1600mhz) but definatly not both, but i think the 1920 sp's is likly
 

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#13
512 bit gddr5 at 1600mhz (6400mhz effective) 64 rop's and 96 tmu's and 1920 stream processors and 1000mhz core speed would be a beautiful card
$1000 graphics card
 

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#14
:laugh: dam straight im in a dream world, first off i woudl expect another 850mhz core speed, i think 512bit may be possible with current speed gddr5 or a 256bit with super fast gddr5 (1600mhz) but definatly not both, but i think the 1920 sp's is likly
id say 256 bit with 1600mhz (6400mhz) GDDR5, 850mhz core is what they seem to like now for XT variants. also I agree 1920 sp's looks likely, but given the Barts core has 32 ROPS, I am very keen to see where they go ROP wise, if its 48 or more you are looking at a serious increase in AA grunt right there, and they will have finally caught if not surpassed Nv on that front.
 
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#15
6870 with 64 rops, this thing will be a monster any way you slice it, i just hope they do a better job with the 6830 than the 5830, because that card is pointless
 
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#16
Looking sweet! - I may just have to pick one of these up....
 
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#17
$1000 graphics card
Very good point, the only reason i have a 4870 is because how cheap it was for the power, if the 6870 was the worlds most powerful single chip card at $1000 i'm sure i would be choosing between the 5xxx or 4xx cards.
 

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#18
Sounds great, but it's positioned against the GTX 460?. So one of my GTX 470's probably beat ''bart'' to fair extent.

Guess I'll wait for the 6870/6850.:)
 

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#19
If you'd like to save a kitten liked this story, please digg it. :)
 
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#20
They better call this the HD6770, if they change the naming scheme around and call it the HD6870, then thats just retarded cause the HD5870 would be more powerful then a HD6870 judging from those specs shown and the rumours about AMD's new naming scheme.
 

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#21
They better call this the HD6770, if they change the naming scheme around and call it the HD6870, then thats just retarded cause the HD5870 would be more powerful then a HD6870 judging from those specs shown and the rumours about AMD's new naming scheme.
Barts is supposed to be the ''6750''/''6770'', it's meant to ''fight'' with the GTX 460.

So the 6870 should technically be better.
 
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#22
Barts is supposed to be the ''6750''/''6770'', it's meant to ''fight'' with the GTX 460.

So the 6870 should technically be better.
Yeah I figured it would be named that:rolleyes:, but hearing all the rumours about the HD6770 is going to be name the HD6870:eek: and the HD6870 was going to change to the HD6970:wtf: and the dual GPU would be the HD6990:cry::cry: I just thought it was stupid:banghead:
 

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#23
Yeah I figured it would be named that:rolleyes:, but hearing all the rumours about the HD6770 is going to be name the HD6870:eek: and the HD6870 was going to change to the HD6970:wtf: and the dual GPU would be the HD6990:cry::cry: I just thought it was stupid:banghead:
That would suck. It would cause way to much confusion:shadedshu
 
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#24
glad to see things moving in the red camp, since i got the 5830 though ill wait for the 7xxx or 8xxx series
 

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#25
glad to see things moving in the red camp, since i got the 5830 though ill wait for the 7xxx or 8xxx series
Sell that 5830, pick up some extra cash, and buy a 5870/5970(or GTX 480) instead if you want to wait till the 7 or 8 series.:)