Originally posted by: lopri
That's a pretty big gap there and I still don't understand why X2900 takes such a big toll by AA. (Is there any 'official' explanation?)
R600 did not put AA hardware on their ROPs meaning that all the AA was being perfomed on the shaders i.e shader AA. Shader AA has a more pronounced hit than your traditional method of doing AA. This is why even with new drivers, AA performance will NEVER be fixed. The irony is that G80 can do shader AA as well as traditional AA 9through AA resolve in the ROPs). Another sad fact is that G80 loses about 25% performance when performing shader AA compared to R600s 30%.
On Topic: At this point I gave up on the 'refresh' of G80. We're already heading towards end of July, and NV stated that G92 will debut around November time-frame. (In a share holders' meeting) Since there hasn't been any 'leak' regarding G81 around the web, that leaves about 3 months of window for NV to introduce/sell new SKUs. I don't think NV will mess up the price hierarchy, when 8800 GTX/GTS are selling well. It's possible, however, that they could make 7900 GS/GTO type of SKUs (of which the main purpose would be to get rid of G80 inventory) just before or after the launch of G92. It looks like the 8800 GTX will be the first card in a long, long time that will maintain its market value from its debut till its replacement arrives.
QFT. Good post.