yeah, an overclock could help you alot. since the game is very dependent on just about every component in your system, so you need to push it hard.
if its stuttering i owuld suspect its hacing trouble with loading data though. perhaps your RAM/HDD is the culprit. if either of these are sub-par, then the game will stutter as it moves data between them.
try OCing first though. even if only by a few hundred Mhz
yorro, I was running crysis on all high settings on a core i7950 with 2 4870x2's and at the time a driver issue was the cause of the lagg..i updated my drivers and the performance improved..
however, some think this game , while being great, could have been coded better..
iam also running 2 4870 and still get stuttering in crysis,i dont know of any rig that runs it smooth on very high settings,i have brought it from steam and cannot play it as everytime i go to apply settings,key or graphic settings it crashes,i have to re-boot my pc,its just a very glichy game iam affraid