I thought my C400's @ 624 were stable until I ran an hour of SETI. Even watercooled, the CPU temps climb to 120F. My BP6 system temp gets over 140, too. I have a hard time believing that a big heatsink would be adequate while running a power-hungry application like SETI. It's crazy how much heat comes off a severely overclocked processor, ain't it. Try an hour of SETI and let us know what the temps are.
P4 firstname.lastname@example.org dual R134A phase change chillers with 600watt thermoelectric array. Capable of -70F
Nixie tube numeric display control panel and pneumatic motherboard tray.