GTX480 Underperformance

Hello,

My Computer:
Cooler Master 750W PSU
Intel i7 950@3.06GHz
4GB Corsair @1066MHz
Leadtek GTX480
EVGA Intel X58 SLI3 Motherboard

Ok well I found out recently that my CPU, according to RealTemp, is running around 90 degrees idle on a stock cooler, so i'm getting a new heatsink, but i doubt CPU bottlenecking has to do with this problem, as it's an i7

Basically, i'm getting very low framerates for this quality of card. On the Just cause 2 Benchmark, native res of 1920*1xxx, everything on and up on high, i get an average of 24 fps. On FRAPS, i get about 24 fps average on Battlefield Bad Company 2, and an average of 20-30 for Civ 5. These games are running at high, but on a 1280*xxx res. I have no idea why my GPU is performing so badly, especially as even people with CPU bottlenecking the GPU seem to have better performance, getting around 40-50. In addition, other benchmarks for my card seem to put it at 50-6fps on native res and everything

Thanks