I have a Dell XPS R-350. I would like to upgrade to a P-III 800 or 850. Which would be the best CPU to upgrade on this type of PC. It's got 100 fsb, I'm not real adept at screwing around uner the hood so which would be the best choice requiring the least screwing around with anything else(i.e. Voltage, fan, slot)Any help would be greatly appreciated. thank you