TOOK YOUR ADVICE! i didn't buy that celeron (2.0 ghz) Instead i bought a 2.0A ghz pentium 4...and tell you what, its a real BEAST of a processor. I overclocked it to 2500 Mhz in ONE GO! the minute i set it up! With no extra cooling! (only the heatsink/fan that came in the retail box) Though the FSB is 400 mhz, the bios says that the clock multiplier is 20(i dunno why) I overclocked it by increasing the 'cpu frequency' as it says, which i increased from 100 to 125 (i dunno why its in hundreds) But this is a real cool processor. My motherboard's bios doesn't support increasing of the cpu VCORE voltage or i would have easily overclocked it to about 1.9. I did try to overclock it further and it went to 1600 something but it wasn't stable (as the KDE in my redhat linux failed to start) It is stable till 1500 something but i've set it at 1500 as i don't have extra cooling (i don't even have a case fan) The temperature is 45 when its idle so i guess it will be around 51-52 when on full load (is that alright?) anyway, thnks guys i didn't buy that celeron (pphew!)

celerons suck

Yup, Celerons do suckz. I will tell you how you how you get 2500Mhz since you not to sure. 100 (20) = 2.0Ghz, and you increased the CPU frequency to 125, which is 125(20)=2500Mhz ~Death-Knight~

ya i know, but shouldn't the fsb of a p4 2.0 be 400 mhz?

Pentium 4 processors use a quad-pumped (quad data rate) FSB. This means 4 instructions are executed per clock cycle. Before you overclocked, your FSB was set to 400MHz (100MHz x 4 = 400MHz). Your current FSB setting is 500MHz (125MHz x 4 = 500MHz).

Glad to help!