my test result:-
win7 x64 - i3 proc / 4G ram

3x 1070 G1 (+0/+700 @912mv) =367 sol/s (122 sol/s each card)
1x 1060 6G gaming x (+0/+700 @912mv) =90sols
1x 1060 3G palit dual-fan (+0/700 @900mv) =83sols