Again, not my point, you 680 SLI and i5(I assume 2500k) are atleast 3 times faster then that rig.
Your i5 2500K(Not sure) vs Q9550
Your GTX680 vs GTX285
In pure FP DP numbers the difference is enourmous. You said i5 runned like ****, so I find it hard to believe.
Well I do have i5, but...