One thing, if you did install CFS3 first to patch it make sure you do a "full" install not a minimum one that has been known to cause stuttering for some. But mostle there is no need to install CFS3. Make sure WOFF is on your fastest drive, and try changing vsync settings (also options in WOFF Workshops). There are optimisation tips in the FAQ section 20 go through all of those if you haven't.

This should be in the technical section so I'll move it there.

If you are overclocking reduce it (you should turn off all overclocking and test) - and try disabling Intel throttling in the BIOS but make sure you have adequate cooling and it's working properly.