Why not grab an 8 core Xeon E5 class CPU? 8 cores 16 threads ;)
These are monsters and you won't need them weaker 6 core i7 Xtreme things for the same money you have more cores and more threads and greater OC results too, even I'd prefer to go Dual CPU with such cards, my Dual Six Core Opteron 2435 D0 can handle Dual 690's without speed loss hehe.
Going Dual Xeon is also an idea, Supermicro has some sweet Dual LGA 2011 boards too and G34, which I'd go for, but yeah once a Dual Opteron Die Hard always one.
The motherboard my main setup uses is this one :)
http://www.supermicro.com...CP55/H8DAE-2.cfm It's the best motherboard I ever bought, even being 3 years old it handles everything without speedloss. CPU's are from 2010, 2.6Ghz Six Core OpteronDP 2435 D0 Istanbuls, my GTX 295 RE's are good enough for my needs, it's mainly used for MD5 Hashing, HD Video compiling, converting from gamenights I have with the Descent Task Force, Flight & Ship Simulations are also done with it, and some new-gen games like CoD MW2 and JC2, but that is really it. Simulations, the main games played on it are Descent 1 & 2 with the Descent task Force, during gameplay I record and remix the game sessions with trance or other styles of music, it allows me to run 24 threads without speed loss, even that it has 12 CPU cores.
I had an i7 even OC'ed to 4Ghz + it was too underpowered, thus I sold it, as for my X79 setup I am not pleased with it and I hardly use it thus I sold it also after only having it for like 4 weeks. 4 cores is insufficient as for Hyperthreading for the things I use my system for HT was rather useless than useful.
Oh well.
