Ok, so here is 6 cores running at 4.1ghz. Temps are starting to creep up there.
Right now, I had the system completely out of the case, but now, I've put it back in -- the temps are significantly lower. I removed the blue gigabyte logo thingy from the mosfet and northbridge heatsinks, it seemed to be trapping the heat, and I flipped the processor heatsink so that the fan was facing down, blowing thru the heatsink and onto the northbridge.
I think I've found the best 4 cores, to really push for my 4.3+ tests. Time will tell...honestly, I notice very little difference between 4 and 6 cores, even in multi threaded applications, like video capture and encoding.