AMD Radeon HD 6700 Series ''Barts'' Specs Sheet Surfaces

[btarunr]

Here is the slide we've been waiting for, the specs sheet of AMD's next-generation Radeon HD 6700 series GPUs, based on a new, radically redesigned core, codenamed "Barts". The XT variant denotes Radeon HD 6770, and Pro denotes HD 6750. AMD claims that the HD 6700 series will pack "Twice the Horsepower", over previous generation HD 5700 series. Compared to the "Juniper" die that went into making the Radeon HD 5700 series, Barts features twice the memory bandwidth thanks to its 256-bit wide high-speed memory interface, key components such as the SIMD arrays split into two blocks (like on Cypress), and we're now getting to learn that it uses a more efficient 4-D stream processor design. There are 1280 stream processors available to the HD 6770 (Barts XT), and 1120 stream processors to the HD 6750 (Barts Pro). Both SKUs use the full 256-bit memory bus width.

The most interesting specification here is the shader compute power. Barts XT churns out 2.3 TFLOP/s with 1280 stream processors, GPU clocked at 900 MHz, while the Radeon HD 5870 manages 2.72 TFLOP/s with 1600 stream processors, 850 MHz. So indeed the redesigned SIMD core is working its magic. Z/Stencil performance also shot up more than 100% over the Radeon HD 5700 series. Both the HD 6770 and HD 6750 will be equipped with 5 GT/s memory chips, at least on the reference-design cards, which are technically capable of running at 1250 MHz (5 GHz effective), though are clocked at 1050 MHz (4.20 GHz effective) on HD 6770, and 1000 MHz (4 GHz effective) on HD 6750. Although these design changes will inevitably result in a larger die compared to Juniper, it could still be smaller than Cypress, and hence, more energy-efficient.



Source: PCinLife

[DRDNA]

Nice ...thank you kind Sir!
Can't wait to see some benching!

[MoonPig]

So the 6770 will be ever so slightly more powerful than the 5870? Must be why it needs 2x 6pin.

the 5770 wasn't more powerful than the 4870... so maybe the 6970 will be stupidly powerful... haha

[Roph]

Looks like my next card will be a 6700 series card. Good job AMD, my money is waiting for you

[caleb]

Is the 6750 a next 5750 or 5850 ?
This naming scheme is starting to be confusing

[btarunr]

Originally Posted by caleb

Is the 6750 a next 5750 or 5850 ?
This naming scheme is starting to be confusing

6750 is the next 5750.

[Loosenut]

Wonder if they improved scalling for xfire?

[Zehnsucht]

These better rofl stomp the existing 58xx series, otherwise those will never go down in price

Look at the lowest price (in SEK) for the 5850. It's higher now than a year ago.

[btarunr]

Blind guess, if Cayman is 640(x4) keeping up with trend, it should feature 2560 stream processors.

[de.das.dude]

thanks doc!

[983264]

It looks like the 6770 OVERPOWER the 5850, although the Memory clock of the 6770(1050MHz) is a bit lower than the 5770(1200MHz)... But the core clock is much higher than the 5870(850MHz vs. 6770's 900MHz in stock)...

BTW, is the 6770 is 128bit or 256bit?

[Tatty_One]

Originally Posted by 983264

It looks like the 6770 OVERPOWER the 5850, although the Memory clock of the 6770(MHz) is a bit lower than the 5770(1200MHz)... But the core clock is much higher than the 5870(850MHz vs. 6770's 900MHz in stock)...

BTW, is the 6770 is 128bit or 256bit?

he said 256bit.

[yogurt_21]

Originally Posted by btarunr

Blind guess, if Cayman is 640(x4) keeping up with trend, it should feature 2560 stream processors.

which there is also a trend between the 5700's and 5800's of doubling the rop's, memory bit rate and texture units.

though that would create one monster card and seems like it would be too expensive.

[MrMilli]

I'll quote:
Northern Islands is the next generation of AMD GPU chips that will arrive in 2010 as a successor to Evergreen. Previously, it was assumed that a product codenamed Southern Islands would appear first using Evergreen shaders surrounded by new "Uncore" components, but more recent news suggest that AMD is jumping directly to their next generation shaders on the existing 40 nm TSMC fabrication process.

The biggest change is in the shaders, they have gone from a 4 simple + 1 complex arrangement to a 4 medium complexity arrangement. This should end up no slower than the old way for simple calculations, the overwhelming majority of the workload, but also be faster for most of the complex operations. [...] Since the shader count is 80% of the old grouping, there is some space saved, and on top of that AMD has had a lot of time to optimize area. On the down side, each shader is marginally bigger, but the end result is a cluster of four new shaders that is smaller than the old 4+1 group, and faster too.
— Charlie Demerjian

[HXL492]

Originally Posted by btarunr

6750 is the next 5750.

The 6750 may be the next 5750 but it will bring a huge performance increase. Just like how the 5770 performs like the 4870

[btarunr]

Originally Posted by HXL492

The 6750 may be the next 5750 but it will bring a huge performance increase. Just like how the 5770 performs like the 4870

Where did I say on the contrary?

[wahdangun]

so its just like evergreen to RV 770 all over again and i'm glad AMD kept their promise to double everything on every generation (performance wise)

[HXL492]

Originally Posted by btarunr

Where did I say on the contrary?

Sorry let me reword that

The 6750 is the next 5750 plus it will bring a huge performance increase

[Kitkat]

sounds cool im switching to water soon so may skip but if those numbers are true might haveta look first lol.

[JATownes]

This makes me happy that I held on to my 4850s for his long. Skipping the 5000 series might not have been such a bad idea after all.

[shb-]

I woder whats the source of this info e.g. where those dudes @ pc-in-life got it .

[CDdude55]

Very nice specs for a midrange performance card, doubling everything is never a bad thing

Though i am really waiting to see what the 68** series is all about. And if they're good, hopefully i'll have a job by then to get a card in that series.(and that's if it can beat my current GTX 470 by a good amount)

[TheMailMan78]

6770=5850. Ok WTF.

[bear jesus]

Originally Posted by TheMailMan78

6770=5850. Ok WTF.

Does that mean 6870 = 5970?
I must admit i would love that.

[20mmrain]

So from what I can tell the 6770 will be around a 5850/5870 performance area? And the 6750 will be around the 5830/5850 performance area?

With powerful enough tessellation (Rumored) to take down the GTX 400 series. Man if this is the case... why spend $599 for a 6870 when you could get two of these trounce a 6870 and be able to play any game out there.

Hope fully they won't make it like Nvidia did and only have it two way Xfire/SLI. Because if they allowed 3-way.... while it might hurt 6870 sales.... it would kill any GTX 460 sales for sure! I thought that was the whole Idea of releasing these cards first anyway's wasn't it?

Ahhh just hoping...3 or 4 of these would be really fun!!!