ok man i was totally terrified that i was going to like burn down my house.
this is the deal, no sh*t.
let's talk about cpu...
take it in small steps, i.e. 5 mhz.
when you make the changes is bios and exit, it will either boot, or not.
if it doesnt, re-start and go one 5mhz step down.
then it will probly boot.
run prime 95.
if it shows errors, either:
a. your cpu voltage is a step too low
b. YOUR HOUSE IS ON FIRE
b. your cpu is unstable at this speed.
and it will show errors QUICK if your sys is flaky, like within 10 minutes.
you have to fool with the voltage and speed to find a setting that works, and every cpu is different. i found my 4200's sweet spot at 237mhz and 1.375v. i could probably get a little more, but i am good with that right now.
there are a lot of articles on doing it, but you will be extremely lucky to find one that uses all the same components as your system.
here is the link i found really useful and as a base from which to start:
keep in mind this is for a 4200. but they are quite likely the same. good place to start, anyway.
my point is, you aint gonna fry your system if you do some reading and remember...baby steps.