Monday, September 27th 2010
AMD Radeon HD 6700 Series ''Barts'' Specs Sheet Surfaces
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
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.
245 Comments on AMD Radeon HD 6700 Series ''Barts'' Specs Sheet Surfaces
Not really big on tessellation performance as it's something not used in many games anyways, so it's definitely not something i would stress out about. If real world gaming performance is much better on a 68** series card then it has my attention.
I think it also depends a lot on the 6870's performance, getting two 6770's may equal one 6870, but if the 6870 is powerful enough, i think it would be best to just get one of those and then another one later, two of those should be almost equivalent to 4 6770's assuming one 6870 is about as powerful as two 6770's(which it probably is), then you also get the benefit of better scaling with only two cards and opposed to something like 3 or 4.
Just imagine the 6970! :rockout:
And shouldn't it be x5, anyway?
Ran a 5770 and 4870 and they both performed fine with the drivers out at those times.
:rockout::rockout: Or 4 6870s! :laugh: ;)
I run 5850 crossfired and the prob i had was slow map loads on dx10/11 but that got fixed waaaaay back as far as i'm concerned.
I had a pile of pish with running sli'd 7950GT's and my GTX 295 had a few hiccups. Both driver teams have issues ocassionally. I'd say on the whole NV average better drivers* but it doesn't mean the ATI ones are shit.
I think it's more often a flamebait stick or used by 'enthusiastic' brand loyalists to put down the other team when it's doing well.
* - oh yeah, apart from this hiccup this year www.zdnet.com/blog/hardware/warning-nvidia-19675-drivers-can-kill-your-graphics-card/7551
But on topic. I wasn't expecting that (granted it's only a slide) level of performance increase. That is quite good. Hope the thermals and acoustics are good.
But name is still false!
Accroding to nApoleon latest confirmation, HD68xx will be the final name.
Source:ChipHell
To the person who said the 5770 didn't beat a 4870, where have you been?
www.techpowerup.com/reviews/HIS/HD_5770/30.html
beat it only by a few % and lost out in one of the res by a few %, though the point is there was nothing in the overall performance, the new midrange cards are normally on par with the last gen high end (single GPU)