I have a shuttle spacewalker AV40s V1.0 with the latest available BIOS: AV40SA08. I currently have a P4 2.4GHZ 512MB 400FSB Northwood CPU installed and it works perfectly. I have purchased a 2.8 GHZ 512MB 400FSB Northwood CPU but I am not sure if it will work. Shuttle's archive website says the mobo has been "successfully tested" up to 2.5GHZ. I don't know whether that measn that higher clock speed CPUs won't work. My understanding is that these CPUs have the multiplier locked. the BIOS has a maximum multiplier od 24 but it makes no difference anyway; the CPU is locked. My question is: will the mobo and BIOS read the 2.8GHZ cpu or not? If anyone has any experience of this I would be grateful for their shared wisdom.