I've heard alot of peeps claiming that all we have to do is wait for the nVIDIA 7xx0 series to be adopted by Folding@Home, unfortunately this is not going to happen for several reasons.
1. Bandwidth: Internal bandwidth on the ATi x1x00 series, especially the higher end models starting with the x1800 series is pegged at 512bit. Folding@Home makes great use of available bandwidth. The 7xx0 series by nVIDIA is twice as slow being limited to 256bit.
2. Shader Power: ATi's x1x00 series are more capable of higher sustained Shader Op/s (Especially the x19x0 series) this is mainly due to the 48 Shader Units with 2 ALU's each (96 ALU's) vs. nVIDIA's 24 Shader Units with 1 1/2 ALU's each (36 ALU's). Also worth nothing that ATi's VPU's are heavilly threaded and as such this helps boost the shader looping method needed by Folding@Home. This makes the x19x0 series Almost 3 times faster.
3. Dedicated Branching Units: Folding@Home makes HEAVY usage of shader loops and Dynamic Branching calls. As a result ATi's x1x00 series have a dedicated Branching Unit which enables them to process the code in a single pass rather then 4 PASSES on nVIDIA 7xx0 series. 4 Times faster.
When all 3 are put together you get to see why it's not feasible or useful for nVIDIA GPU's to be used as multi purpose processors. Heck, even in Physics calculations they're VERY slow compared to ATi's x1x00 series. also worth noting that Folding@Home does not support Multi-GPU or Multi-CPU hence rendering the 7950GX2 useless for such operations.
But, don't worry there is light at the end of the tunnel. G80 will enable nVIDIA to catch up to ATi and even surpass ATi.. that is.. until R600 is released.
So don't be angry that Folding@Home doesn't support your nice nVIDIA card. Simply save up for G80.
1. Bandwidth: Internal bandwidth on the ATi x1x00 series, especially the higher end models starting with the x1800 series is pegged at 512bit. Folding@Home makes great use of available bandwidth. The 7xx0 series by nVIDIA is twice as slow being limited to 256bit.
2. Shader Power: ATi's x1x00 series are more capable of higher sustained Shader Op/s (Especially the x19x0 series) this is mainly due to the 48 Shader Units with 2 ALU's each (96 ALU's) vs. nVIDIA's 24 Shader Units with 1 1/2 ALU's each (36 ALU's). Also worth nothing that ATi's VPU's are heavilly threaded and as such this helps boost the shader looping method needed by Folding@Home. This makes the x19x0 series Almost 3 times faster.
3. Dedicated Branching Units: Folding@Home makes HEAVY usage of shader loops and Dynamic Branching calls. As a result ATi's x1x00 series have a dedicated Branching Unit which enables them to process the code in a single pass rather then 4 PASSES on nVIDIA 7xx0 series. 4 Times faster.
When all 3 are put together you get to see why it's not feasible or useful for nVIDIA GPU's to be used as multi purpose processors. Heck, even in Physics calculations they're VERY slow compared to ATi's x1x00 series. also worth noting that Folding@Home does not support Multi-GPU or Multi-CPU hence rendering the 7950GX2 useless for such operations.
But, don't worry there is light at the end of the tunnel. G80 will enable nVIDIA to catch up to ATi and even surpass ATi.. that is.. until R600 is released.
So don't be angry that Folding@Home doesn't support your nice nVIDIA card. Simply save up for G80.