danial

http://www.beyond3d.com/forum/showthread.php?t=29673

http://ps3forums.com/viewtopic.php?t=19285&start=0

http://forums.e-mpire.com/showthread.php?t=54240

http://rei-rom.com/forums/index.php?showtopic=55681


It was previously believed that PlayStation3's graphics processor, the RSX aka Reality Synthesizer, would be a custom G70 (NV47) which is the GeForce 7800 GTX, or the newer 90nm version, the G71 ~ GeForce 7900.

It was known since E3 2005 that PS3's RSX GPU would only have a 128-bit memory bus connected to the GDDR3 memory.

It was believed that RSX would only have 8 pixel pipelines aka ROPs (not to be confused with pixel SHADER pipes) compared to the 16 pixel pipelines ~ ROPs that are in both G70 ~ GeForce 7800 GTX and G71 ~ GeForce 7900.

but now word is spreading that RSX is SIGNIFICANTLY LESS POWERFUL than even this known reduction compared to GeForce 7800 and 7900.

It has been discovered that RSX only produces 384 floating point operations per clock cycle (MHz) compared to the 700+ (in the 700s) floating point operations per clock cycle that the G70 ~ GeForce 7800 GTX does.

It is now suspected (not yet proven) that RSX has 6 Vertex Shaders
( instead of 8 ) and 12 Pixel Shaders ( instead of 24 ) that both GeForce 7800 GTX and 7900 have.

IF TRUE, this would bring RSX *closer* in performance to the less-powerful G73 ~ GeForce 7600 GT

now, in some of the other threads, the OP is saying that
RSX = GeForce 7600 GT.

that would not be precisely correct. i.e. the 7600 GT has 5 Vertex Shaders and RSX might have 6.


however, it looks VERY likely that RSX is a lot LESS powerful than the

high-end PC Nvidia GPUs.

and could very well make RSX significantly less powerful, when all is said and done, than the ATI Xenos GPU in Xbox 360.


If RSX has 24 pixel shaders, why was that not displayed in the recent GDC slide ?