I was having a search in google and i can see u have the same problem as me
Spec:
Cooler Master Real Power M620 PSU
Asus Striker Extreme MOBO
Corsair Dominator RAM
Intel Q6600 G0 Stepping CPU
BFG 8800 GTS 512 Pre-OC GPU
Samsung Spinpoint F1 750GB HD
It only whines when i open a powerful game or overclock my cpu to 3.0 ghz or more!
Rem`uK