I have a Dell Dimension XPS P100c computer. I would like to upgrade the CPU. I have contacted Dell and they say that the maximum speed CPU that I can put in my computer is 133MHz. I have contacted Evergreen Tech. and they say that their Spectra 400 will work in my system with a file that I can download from their site. Since I talked to Evergreen Tech., I have received an advertisment for Evergreen Tech.'s 200MHz CPU for only $59. Their ads say that it will work with any 75MHz or higher computer. Has anyone made either upgrade to a Dell XPS P100c?