I got a custom computer with a Celeron 2.4Ghz. I have a few Pentium 2.4's around. Everest says that my motherboard is: Effective clock - 533Mhz

I have two Pentium 4 2.4ghz. One says 533 on it and the other says 800 on it. The exact markings are 2.4Ghz/512/800 and the other one is listed with /533

Should I stay away from the 800 and just use the 533 or can I use either cpu with this motherboard. The mobo is a ASRock P4i65GV

Don't want to cook anything.