All the comparison tests I have seen showing ppd produced by each graphics card, as well as the power draw while folding, favor the Nvidia cards.
And it seems a comparison of ppd produced for every watt consumed, the more productive graphics cards are often more power-hungry and expensive.
I see Nvidia cards dominating the top end of the graphs, as Nvidia has ruled the Folding performance charts for a few years now.
This isn't because AMD's hardware is inferior. Essentially Nvidia cards are thought to be more suited and better supported for folding.
The only guess I have as to why is,.. Due to a difference in the implementation, the ATI code must do two force calculations where the x86, Cell, and Nvidia hardware need only do one. This increases the overall native FLOP count for ATI hardware.
Personally the only thing better than more points is more points without more electricity consumed,.. and a pair of GTX 560 Ti 1GB cards are significantly more power-efficient than the top performance cards, but they do vary well in the total PPD Benchmarks.
The HD 7870-1000MHz/4.8GHz 2GB GDDR5 card would be a vary close match for the GTX 660 Ti-915MHz/6.006GHz 2GB GDDR5 card in a Benchmark.
but the 560 Ti is not in the same class as the much more powerful HD 7870 card.
Edit : Thanks db,.. now I'm confused. I just checked prices and the HD 7870 is only $49.00 more than the GTX 560 Ti.
Thought I was finished comparing benchmarks, power consumption,... must be the booze, I need some.
Edited by Braegnok, 20 January 2013 - 06:22 PM.