Pioneer Xenon

Which of the following processor configurations is better?
2 Intel xenon 5680 over clocked to 4.3 ghz (has 12 threads 6 cores each) or the i7 990x at 4.4ghz
Its for a gaming PC i am building and i want it to be the best ever. i already have 4x gt x 580 h.c.2, 4x o.c.z. vertex 2 raid 0, pioneer blue-ray burner, xoner xense sound card, 4i raid controller, thermal-take 10 case, e.k. water-blocks liquid cooling with silent fans and a 1500w SS
which processor is better?.
The 990x will be enough for quad sli
