<< I've been told if you have an OEM version of a CPU then there is no thermal paste. >>
Half correct coz termal pad/paste comes w/ the HSF. OEM CPU didn't come w/ HSF...so didn't come w/ termal pad/paste either
<< What exactly is thermal paste (where does it go)? >>
Is a substance tht u put between the CPU core & the HSF to allow better transfer of heat. It is use to fill up the microscopic area of the inperfect bottom of the HSF to allow better contact w/ the CPU core.
<< Is thermal paste a must to have for an AMD XP 1600+ CPU? >>
It is a must for all CPU + HSF installation especially AMD based PC as AMD tend to produce more heat.
<< Where can you get thermal paste and about how much does it cost if its important for the CPU? >>
Dun worry. The paste/pad will come w/ every HSF u buy...it comes w/ the HSF.
<< Also anyone have suggestions on a fan and heat sink to use with the XP 1600+ cpu, >>
If u dun plan to O/C, no need to spend $$ on a high-end HSF. SK-6 seems to be a good choice. Otherwise, look at the volcano series & the coolermaster series of HSF.
<< and what should the idle and processing temp be? >>
I'll need ur ambient temp. Then case & CPU temp both idle & f/load to tell if ur temp is OK.