What motherboard do you have? Complete system specifications would help also.
EVGA 141-BL-E757-TR LGA 1366 Intel X58 ATX X58 SLI LE Intel Motherboard
Intel Core i7 920
EVGA 896-P3-1257-AR GeForce GTX 260 Core 216 Superclocked Edition 896MB
OCZ Gold 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)
Antec BP550 Plus 550W Continuous Power ATX12V V2.2
I ran gpu-z while playing my game (COD2) today and the log showed GPU load % between 50-90. I don't know if this is average or not but according to the 3dmark06 test, this thing is abnormally slow for the hardware.