You still got an X79 rig to test that hypothesis Kaap, because i can't see how even with the lower clocks the efficiency of HW-E wont either even it out or actually offer more performance. What do i know though, never ran 4 cards and only ever used X79![]()
Gregster has helped out here without realising it
The other day he ran a 290X @1200/1500 on his 3930k @4.4 on Firestrike ultra.
So I used the same settings on X99 with a single 290X and this is the comparison, there is very little difference in graphics scores.
http://www.3dmark.com/compare/fs/4286216/fs/4299851
I also need to point out that I am using water and Greg is using air.
There is no huge magic advantage to using X99 but there is one massive disadvantage, X99 is nowhere near as good at overclocking as SB-E.