I have just aquired a used compaqpro and would like to know if I can upgrade the Pentium ll 400 mhz 100 with MMx Technologies CPU part #328619-002 on this motherboard part #178919-001. And if so with which Pentium. Please be specific as I am very new to computer upgrading and I don't want to mess this one up. Could I go with a faster Pentium ll or even a Pentium lll. And do I need to purchase a new heatsink with it. Thank you in advance for all your help or input. tlgas1