Unreal Tournament 2003
When moving from the 242 to the 244, it gives an increase of almost 15 frames per second. When using two processors, the single processor is only slightly faster, with the difference being no more than 2 FPS.
Jedi Knight 2
The difference between a single 242 and a dual 242 is a mere .6FPS but when moving to a single 244 and a dual 244 the difference is 4 FPS, which is almost 10%.
With a massive amount of frames coming out already, we see the step up to the 244 Opteron gives an extra 27 frames per second.