Sorry i haven't told you about the intel heatsink mod...i have been busy with my rig...screw the intel retail crap...I picked myself up a 20 dollar heatink that probably cools like or better than an alpha. It is a socket A heatsink that fits on a FCPGA so i use it...and get temps like 26.0 C idle and 35 - 37 C full load im at 1.65v (1.7v default) @ 877 (83 fsb) i need 1.05ghz soo bad...even at 2.4v it won't post...maybe a good burn in thatz what im doing right now. Ok now to your question about cC0 or cB0...to find out download sisoft sandra and run the cpu/bios information module and it should say something about a stepping mask...look at that and reply to me and say what it says. mine says C0 that means i have a cC0 if it says B0 then you have a cB0...Generally cC0's tend to o/c higher than cB0's...but in some cases cB0's o/c higher...just the luck of the draw. I need more information about your setup...voltages...temps...manufactruerers...ram.. .hard drives...etc. Glad to help...If anyone needs any help on CELERON II 700's then i would be glad to help since i have had quite a bit of heart ache with them!!!