What resolution you game at?
Which gfx card do you have?
Anyways,Both chips are very good and both can be unlocked.
i play at 1280x1024
and have a 9800gt
If you're playing at that resolution then you may not notice ANY performance difference between the two chips.They are more than enough to handle 9800GT(Which is still plenty for 1280x1024).
You should not be worried about the proccesor. Both of them can handle much better cards. So whenever you feel any slowdowns you should look for GPU upgrade.