p3 800E and 800EB??

The multiplier and bus speed. The 800E is 8 x 100. The 800EB is 6 x 133. Since the multiplier is locked, if you are into overclocking, you can do more with the 800E.
 
jlbigguy has it right. crashman too (700E, of course)

I easily overclocked my 700E to 7X133=933, so I went on and tried 140FSB(35MHzPCI). No problem. This ASUS P3B-F with CuMine support runs 35 to 50 C at 7X 140FSB=980MHz.. yes, 980 (more spiky than 'underclocked @ 700', but under control with Golden Orb). I got a zero error stability certificate (will post if you want to see it.. just tell me where).
ASUS GeForce 32Mb Pure is running stable@93MHz !!