I have that EXACT processor, video card, 4 GB DDR3 ram.. and also run Win7 64bit.
With 1024 Textures (and hi-res pack installed), all sliders maxed, all advanced options on except self-shadowing, 1680X1050 resolution, and the AA slider set to FULL.. I almost NEVER see the FR dip below 55.. maybe in the heat of a lot of action with flames and smoke nearby I MIGHT see 48FPS.
This is also with AVAST and TrackIR5 running... and with a USB sound device (surround sound headphones). It's also a fresh install of WIN7 without any bloatware...
OK.. 43 processes right now.. wow!
Anyways... just to give you something to compare yours to...