Your computer is beefy and all but those games are just super beefy themselves, especially FEAR.....the soft shadows especially are just ridiculous performance killers.
get an Nvsilencer and start OC'ing that graphics card.
I got my 6800GT runnings 450/1200 which is beyond that ultra of yours, not to mention my 1gb of RAM is running DDR500 and CPU is at 2.5GHz which in terms of being compared to an FX is probably about 200MHz behind being equal since Mhz to MHz yours would be faster if mine was at 2.6GHz as well....I still don't run FEAR with soft shadows on though, it just isn't worth it...it's something you'd barely notice and doesn't look that good.
CoD2 however runs beautifully maxed settings except for one setting...I had to turn down 'world resolution' to 'high' instead of 'EXTRA' lol
I never use Vsync either.
Like I said though you should really look into getting an NvSilencer and just OC the crap out of your Ultra.