If you've had your computer for over a couple years now, might I suggest that you clean the CPU and heatsink/reapply thermal paste. It's always nice to clean everything up when you get the chance (only if you're comfortable with this though).
Current Build (Hope to finish by late spring):
Intel Q6600 g0
Asus Maximus Formula
geIL Evo 2GB (2x1gb) DDR2
ATI HD3870 X2 or Nvidia 9800 X2?
2x 150gb RaptorX (Have it)
Thermaltake Toughpower 750w PSU (Have it)
Antec P182 Case
HP w2207 22" Monitor (Have it)