Well said D0c1021, even I had trouble with the dipsiwtches. on this board. its not complicated, the dipswitched are thoe little switches you'lle see near the top next to the processor and the NEC network card. Theres a few on the board, I cant exactly rember which one it was, but this board takes some tiem to get used to. Its not like most boards with its Phoenix Bios, and all sorts of odd things.
Check your temperatures, its not the Board, my temperatures are fine. IF all is well, and Artic Silver 3 is applied all in the right places, and your heatsink and han are installed correct, I suggest some CPU Copper shims at last resort, they add a space between the CPU and the heatsink to absorb as much heat as possible.
And make sure your not slatering on the Thermal-paste like suntan lotion, a thin, layer all over the processor core will do fine. Its not meant to be sued as glue, just rember :)