Slot 1 = First 5970
Slot 3 = Second 5970
Slot 5 = Killer NIC
Slot 6 = Creative X-Fi Titanium (It was free)
Slot 7 = 9800GT for Hybrid PhysX
Also my CPUs don't want to seem to push past 4.3Ghz, one or both have a bad batch, but I have a few more things to try.
Also one of the 5970s is the one I used prior to building the system, and it never overclocked well at all, it won't even go to stock 5870 speeds.
And it already heats the house. TDP of GPUs and CPUs OC'd is over 1000w already.
If I had known how much space I had at the bottom of the case, I could have gotten a better card for PhysX, but this will do for now.
EDIT: Also, you cannot SLI 3 590s, max of 4 GPUs in SLI or Crossfire.
EVGA Classified SR-2 | Intel Xeon X5680 x 2 | Corsair Dominator DDR3-1600 6 x 2GB | XFX HD5970 x 2
Intel PRO/1000 PT Server NIC | ASUS Xonar DX | Corsair AX1200 | Corsair TX750OCZ Vertex2 60GB | WD Velociraptor 300GB x 2 | Samsung Spinpoint MP4 500GBEK-FB SR2 - Acetal+Nickel | EK-Supreme HF - Acetal x 2 | EK-FC5970 Acetal x 2
Thermochill TA120.4 x 3 | Thermochill TA120.3 | Swiftech MCP655 x 2