|The P42.8 is probably a 800Mhz processor and would be a waste on your board. If it ran at the 533Mhz the board is capable of, you'd have a 1.86Ghz machine.|
The others work at either 400 or 533Mhz. The 533 in your P4B533 model number is the clue here.
That is however, a swell 533Mhz motherboard and a good overclocker.
Do you understand that Intel quad pumps their processor specifications? Like...
Your P4 1.8 = 100Mhz(400Mhz)x18 multiplier
Your P4 2.66 = 133Mhz(533Mhz)x20 multiplier
Your Celeron = 133Mhz(533Mhz)x22 multiplier.
For example, using your P4 2.66 the processor speed and overclocking settings are calculated by multiplying 133Mhz fsb times the processor multiplier.
P4 2.66 @ default is 133x20=2660Mhz
For the heck of it, lets say it'll run ok overclocked @ 160Mhzx20. Now you have a 3.2Ghz P4 as 160x20=3200.
Kinda gettin' the idea?