I would like to upgrade the CPU on an older model Compaq Presario 5000/K series desktop. Currently installed is a 900Mhz Duron. I'm not sure what the model MB is, but presume it to be a micro ATX of some description. Would it be possible to "pop" in an Athlon XP 2.0 and if that is possible would the BIOS need upgrading as well? Cheers.