Thanks everyone. More responses are welcomed.
Blain - Thank you for sharing your experience. I am still interested in hearing why disabling the cache seems to help when it appears to be a specific cpu/slotket/mobo combination.
With my related problem, the slotket appears to work at default speeds, but does not when overclocked. The system post, but BSOD after that. Now most people would immediately say that the cpu is at fault. But the cpu has been verified to overclock at default voltage on a CUSL2 ,which of course, uses no adapter.