I'm pretty sure I have the basic default heatsink that came with the cpu. I'm not exactly sure how 2 do this, I know how to get the the BIOS, duh but what do I change exatcly. I'm assuming its not writen as 1.82 etc etc, more complicated right?
Now they start with a bunch of the blah blah about the damn chips (CPUs). If ya want just scroll down to almost the bottom of the page (to the Overclocking heading) and begin reading. Now it looks like they are using the 3000+ but it should go the same for your 2500+. Hope it helps.
Oh, and this guy has an image of the WCPUID showing all pertinent info
1) Whether a chip overclocks or not is a crap shoot. Some do some don't. You can typically get 5-10% but some chips do not overclcok at all.
2) The MB and Bios have to be overclocking friendly to get good results. That means CPU voltage adjust, FSB adjustable in 1% steps, AGP/PCI/PCI-e clock speeds must be independent of the FSB speed, RAM clock speed must be independently adjustable wrt the FSB, a software overclocking utility included and good thermal protection. Note many "name brand" PCs do not allow any overclocking.
You step the FSB up 1% at a time, run a burn in utility (sisoft sandra has one) and run the system for 20 minutes watching the CPU temperature. If it stays stable you increase it another 1% and repeat. You can jump it 2-3% at a time but it adds more risk of crashes and/or data loss.
If the AGP/PCI/PCI-e clocks are not independent of the FSB DO NOT OVERCLOCK. Video cards are much less tolerant of damage than CPUs and RAM.
If your RAM speed is tied to the FSB speed overclocking may not work. If it doesn't you have to relax the ram chip timing settings in bios.
Software overclocking is best if your MB supports it becasue if you mess up you just reboot with minimal risk. If you overclock the Bios then you have to do a CMOS reset which can wipe the Bios on older MB's.
It's not the Athlon XP itself. The chips usually can overclock at least a little bit.
You should check your temperatures of your CPU when you're in the Bios. And see if it's running pretty warm. You probably have the stock heatsink which sadly does not cool all that well. So the best thing to do is get a new heatsink. You should also find out your motherboard. Some boards can overclock better than other ones. Could be your board is limiting the overclocking of the processor. So there's to many variables at the moment. Start narrowing them down a bit by finding out what I suggested.
Oh and nothing else on the computer is really all that important except for your Power Supply and it's wattage. Because sometimes it can't give off enough juice for an overclock.