text: You cannot go from a Intel to an AMD, it is physically impossible in a laptop or a desktop.  The sockets are different. (for more info see the wikipedia link below.)  If you have a Pentium M, then you have a motherboard with a cpu socket 479.  That socket can hold the following: \n\nIntel Pentium M (900 MHz - 2.267 GHz)\nIntel Celeron M (800 MHz - 1.733 GHz)\nIntel Core Duo (1.667 - 2.167 GHz)\nIntel Core Solo (1.667 GHz)\nVIA C7-M (1,5 GHz and 1,8 GHz)\n\nI think that the Core Duo T2700 (2.33 GHz, 31 W, FSB 667 MHz, dual-core) would be the best you can get.  But I would make sure to talk to Dell to make sure you got something compatible with your system.  Dell machines can be really tricky about that.