My home PC is a Presario 7222 which is a P-100 system. I keep reading about processor upgrades with 200MMX chips. How can I find out if one of these upgrades will work in my unit. I have found info on items from Evergreen and PNY Quick Chip. All I have found for sure is that the Evergreen product is "not incompatible" with my computer. Any expert advice on this subject would be appreciated and I might have more questions if I decide to proceed.