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RV770 - more than meets the eye?
Written by Andreas G 06 June 2008 19:48

RV770 is the heart of the Radeon HD 4800 series. It's based on the R6xx architecture, but is supposed to add additional performance and features. The R6xx series of chips, both the R600 and RV670, were substantially different from previous generations as ATI had decided to move the antialiasing processing from the ROPs to the shaders. It was suggested that this was the cause for the cards' lackluster performance in heavy antialiasing and anisotropic filtering environments, even though the latter is handled by a completely different section of the GPU, texture units, and that the AA is not the problem but the AF.

Thus, it's not really fair to blame the shaders for the drop in performance. Somehow stories have started going around that AMD has "fixed" the performance when using antialiasing, which assume is really about the anisotropic filtering. It has been suggested that AMD has reverted back to making the ROPs handling the AA, but that doesn't really make much sense if AF is the problem and not AA, right? Instead, we simply suggest that the fix is the increased number of texture units, something which has been known for a very long time. 

There might be more to it though, we will just have to wait and see. It's not impossible that AMD has made more changes to how AA and AF are handled to improve performance.

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Related news:
2008-10-09 Diamond announces Radeon HD 4670 1GB
2008-10-01 ATI Radeon™ HD 4550 and ATI Radeon™ HD 4350 Graphics Cards Load Up Compelling Gaming and Multimedia Features
2008-09-29 Radeon HD 4830 - great gaming for less than $150
2008-09-29 Radeon HD 4870 1GB slaps NVIDIA on the fingers
2008-09-12 Radeon HD 4670 claims the sub-$100 market

 






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Summer is here. What do you do?

It's summer?
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Too hot to bench ... fiesta time!
Bench even more to lower toom temps
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Family vacation ... I miss my cascade
Bench in the sun, just another challenge