i ran 3.0 on x4 and than i overclocked it to 3.4 and big deal???? gta 4 ran in 30 fps now it runs in 34 fps.. see? no big of a difference
It isn't a big difference, you're right.. but if you really want to see improvements, it's not going to be in games as they are not very CPU dependent. (Although GTA IV is more CPU dependent than average) Photoshop, editing/converting, or a similar productivity application would see a better benefit.
If you can unlock your fourth core, it would be more beneficial than simply having an overclocked tri-core, even if it doesn't OC as high as a quad-core.