I want to know if a HP a1129n will take a AMD Opteron 165? I read on the HP website that it can go up to Athlon 64x. Also I saw that if I want to do a BIOS update for this computer I must only go to the HP website and not the MSI website. If I can't install the Opteron because of the HP BIOS, can I update the BIOS from the MSI website and then use the Opteron? If this is possible will I have to reinstall Windows? Or should I just throw it in and see what happens? Any input would be much appreciated!!