I have quite the same problem here
ASUS SABERTOOTH X58, Socket-1366
Intel Core™ i7 Quad Processor i7-950
G.Skill RL Series RipJaws 12 Go DDR3-SDRAM PC3-10666
I' m trying to test with my old corsair 500w power supply, and for now no crash anymore. (few houres)
but i don't know yet if my power supply is the problem, or Compatibility problem with the mother board with the "Pull" technolology of the power supply.
Did you resolved your problem?
I'll tell you if i found a solution