I just put a P4 3.4 Ghz Prescott CPU into my computer and it comes up as a 3.4 Ghz under model, but the speed is read as 2.8 Ghz. I am confused... I am using Sandra, Dxdiag and the screen durring boot up. Sandra says 3.4 under model and speed as 2.8 Ghz, Dxdiag lists the CPU as 3.4 Ghz Prescott and on startup the screen says 2.8 Ghz. So i want to know what speed it is really running at and if it is really running at 2.8 Ghz, how do I get it to run at its 3.4 Ghz max?