Low FPS for spec?

[NvidiaDan]

Hey all, Been noticing i'm getting about 90FPS in COD4 But my friend is saying he gets about 150 average with the same card as me. Also the rest of my spec is better than his.

Any ways i can increase my FPS some how? (Spec in sig)
Thanks.

 

[NvidiaDan]

I'm playing at 1440x900 and so is he.

I'm not trying to compete with him, i'm just intrigued as to why mine is so much lower.

When i look at FPS while im playing it seems to be locked to 91 as it never rises above that, just flickers between 90 and 91 and drops every now and then to around 50-60.