IF A SPEC sheet leaked onto the internet proves to be the real deal, then it looks like AMD is about to turn the world of graphics cards up-side-down, as the new 67×0-series looks set to be almost as good as the current 58×0-series, while being expected to sell for a similar price as the current 57×0-series. This would cause some serious headache for Nvidia, but we’ll just have to wait and see how AMD price the new cards.
Judging by the numbers on a slide posted on Chiphell, the Radeon HD 6750 – which is the slower and cheaper of the two – would end up somewhere between a Radeon HD 5830 and a Radeon HD 5850 in terms of performance. It manages no less than 1.624 TFlops, slower than the HD 5850, but it should be faster than the HD 5830 (which by the way is missing from the chart). The texture fillrate isn’t quite as good as the HD 5850, but the Z/Stencil buffer offers the same performance at 92.8GSamples/s and it has the same memory bandwidth at 128GB/s. Taking into consideration that this card draws 37W less power at a max board power of 114W, we’re looking at some pretty impressive performance enhancements.
Moving up to the Radeon HD 6770 and things get really interesting as this card outperforms the HD 5850 with a compute performance of 2.304 TFlops, but it’s still behind the Radeon HD 5870. It has a texture fillrate of 57.6Gtexels/s and the pixel fillrate is actually higher than the HD5870 at 28.8GPixels/s compared to 27.2Gpixels/s. The Z/Stencil buffer is also faster at 115.2GSamples/s compared to 108.8GSampels/s for the HD 5870, but the memory bandwidth lags behind at 134.4GB/s compared to 153.5GB/s. At 146W max board power, this card also manages to draw less power than the HD 5850, despite dual 6-pin power connectors.
The HD 6750 features 280 shaders and 56 texture units in a slightly different arrangement as explained here, while the HD 6770 has 320 shaders and 64 texture units. The 6750 is meant to have a core clock of 725MHz and an effective memory clock of 4GHz while the 6770 ups the core speed to 900MHz and the effective memory clock to 4.2GHz. These are very impressive numbers for what should be a pair of upper mainstream gaming cards and not a refresh of the higher-end models. The question is what AMD is going to charge for them, as it’s possible that AMD has done some re-jigging in its product line-up to move these cards slightly higher up in its range.S|A
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