Another upgrade question

[xeefer]

Hello,
I'm currently running a Core2 E8400 3ghz with twin geforce 8800 gt in sli setup. It struggles a bit with some games so I wondered the best method of increasing the power. Would a single gtx 460 be faster? I've had no experience in overclocking so have not gone down this road.
Thanks
Craig

 

[xeefer]

Thanks Malmental,

I have 4GB (2x2GB) of DDR2 400MHz. I've had no experince in overclocking but an certainly willining to give it a go.