Here 3 way 5870 fared better than 2x5970, probably because scaling is not good with 4 gpu's.
The more powerful gpu(in this case, because of clocking) fared better, because of scaling.
3 way at a higher clock speed gave better results than 4 way at lower speeds.
I said the same thing , 3 different ways ~ I believe. http://www.hardware.info/nl-NL/articles/amdnampoZGCa/Cl...