I think it is something to do with the extra RAM putting more stress on the NB??
Or something along those lines!
Google is failing me here, can you point at some of these benchmarks? Specifically for overclocked x58 i7 vs two stock i7 in a Macintosh?
I've been wondering for a long time how 4 @ 4ghz compares to 8 @ 2.66ghz, and all I've got is the former will kill it on single threaded applications