lol diablo, temp monitors didn't come out until the later FX series I beleive.
prime95 seems to be not helping a hell of alot and a pretty annoying thing to use.
Prime95 is a very basic program dude.
Options>Torture test> Large In place FFT's
that puts your CPU at full load and if it errors within a couple hours it's not a stable system. 12+ hours can be considered stable...
use memtest86+ to test your memory to see if that's faulty, but generally faulty memory causes restarts more than lockups