I wouldn't call 3.2 GHz low speeds for a 16 core PD chip. Even so, a 3930K is like 3.5GHz in Turbo Boost. You'd get an insanely high TDP if you would clock it at 4-5 GHz, and it would still be slower than said chips. Not even considering the cost of such a big, relatively low yielding die vs a leaky consumer chip from 3 years back.I don't think it makes sense for AMD to produce those chips in large volumes to really compete.
No problem, glad it worked for you
With complex systems like these it's always good to test as little as possible at a time. There are just a lot of things that can go wrong. I take it that you just had a short inside your chassis (maybe a standoff that didn't line up correctly?)
I haven't dealt with EVGA RMA, but typically you submit an RMA directly (it's faster). Then, the reason for RMA is that the card does not POST (beep from the motherboard speaker).
You also list how you came to this conclusion (testing a different card and mentioning that the 8600GT does POST).