I bought 2 P4 MB's a 865PE by MSI and a 875P by ASUS. Both have the MPS Rev. 1.1 and 1.4 settings. I read in 1 form that it was best to set the Rev to 1.4 if I was useing a Modem, but this was an OversClockers form. I don't wish to OC, I just don't want the system to crach or lock up when playing games or for that fact any time. I'm runing Windows 98SE, 5 Computers, VGA cards are Ti4200 4X, Ti4200 8X, FX5600 Ultra, ATI 9700 Pro. CPU's rang from PIII 1.3 to P4 2.66 and AMD XP1800, 1900, 2100. I just want a basic idea of what the MPS Rev is for and what it does. Thanks everyone for the help.