Usually when I see discrepancies between the speed % and the framerate it's because V-sync or the vbeam hack is on. It's also the case that some games are just weird at certain parts and the speeds don't seem to respond to any changes you make, either on the GPU or CPU side.
You should try some different games out. I generally see an increase of around 10-15fps when my i5-2500k is overclocked; SMG2 gets as much as a 22fps increase. It should be easily noticeable.
You should try some different games out. I generally see an increase of around 10-15fps when my i5-2500k is overclocked; SMG2 gets as much as a 22fps increase. It should be easily noticeable.