Can anybody point me in the right direction for info on how to mod Dell PE1900 BIOS to support newer processor? I bought 2 x Xeon X5260 from eBay and now I find that Dell seem to have chosen not to support this processor for some reason. Despite the machine booting up and correctly identifying 2 x 3.33Ghz processors, it eventually stops just before booting into OS with 'unsupported processor combination'. Maybe I am wrong, but, I can't see why, if the BIOS can support Xeon 5160, it can't support X5260? Surely, it is just a decision in the BIOS? This is despite the notes for the BIOS (2.7) saying that it does support 5200 series Xeon of the stepping I have :-S I have a BIOS image PE1900-020700C.hdr and want some tips on how I go about disassembling it? I am reasonably adept at x86 assembler and use of IDA. Cheers, Rich.