TimStone

>They both support DX9-class features, up through
>Shader model 3.0. (However, the PS3 obviously doesn't >support DX9 itself.) Feature-wise, they're basically
>identical, AFAIK. RSX is a 7800 spin-off, but
>alledgedly faster, and the 360 GPU is the R500 or a
>close cousin, which *probably* later evolved into the >R580, aka the X1900XT.

This statement is also false. The Xbox 360 is NOT Direct X 10 compliant but it does share a few features from Direct X 10 such as unified shader support, Shader Model 3.0+ (4.0 in PC's DX 10), and maybe the MEMEXPORT feature that might be in the PC's DX 10.

The R580 is not a unified shader nor does it have any of the above.