Phosho510, yes its true, the fact its luck of a processor. But since your using a slower processor you have to OC just to get the stock speeds of a 3500. Since 3000 really run at 1.8ghz and the 2800 run at 1.6ghz. So once you OC from 1.8ghz, to 2.2ghz. Now you have to push w/e is left to beat that. But 3500, are already at 2.2ghz, thus they can be pushed more. What im getting at is its easier to OC a 3500 to 2.6ghz then a 3000 at 2.6ghz.
Either way the 3500 is going to OC at higher speeds with less OC. You understand what im getting at? Or maybe you mean mhz in general. But of course a 3500 will OC better then a 3200. Or a 3800 will OC better then a 3500. Its just because they already operate faster.