Update: Alright. Via telephone testing continues. I told my friend to try something unorthodox.
We're now 99% certain that this is a heat issue and something overheats. The 79c sensor is not stuck, but we still have no idea what it is. This was determined like this: He took a huge fan (Larger than the case and extremely powerful) and opened the case, then directed the fan into the case. Temps went down on everything, and we managed to get the 79c sensor down to 77c, and we passed Linpack.
It must be something with no heatsink (Hence the small temp variance even with the massive heat flow) overheating and causing an instability when the case isn't ventilated with the equivalent of a frakkin' hurricane.
Any ideas what it might be on this particular board ?
Cameron: Core i7 2600K 4.5Ghz, MCR220, 2xMCR120, MCP655, ASRock P67 Extreme4, 4GB DDR3, 2xOCZ Vertex 30GB RAID0, GTX470, 2xHD5670, Modu82+ 625W, TT Xaser VI.
Neuromancer: Core i7 975, DFI DK X58-T3eH6, 12GB DDR3 1333Mhz CL6-6-6-15-1T, 3x9600GSO 384MB, Hiper 880W, TT Xaser VI.
Administrator of a 40 core Hadoop