I have uATX Dell 435mt same chipset as the full ATX 435t but Dell did not bother to update the bios with new CPUs such as Xeon. I used mmtool as follows: Dell 435mt.rom shows exactly two CPU IDs: 06A4 and 06A5. I dont know what the 6A4 is but the 6A5 is my i7-920 cpu Dell 435t.rom shows exactly 10 CPU IDs including that older A4 and A5. The Xeon I want to use is the X5675 which is a low power equivalent to the i7-950. It's ID seems to be 206c2 and sure enough the last entry in the dell 435t bios is 06c2. I extracted the 06c2 module from the 435t bios using mmtool 3.22 (version 5 mmtool did not work) Using 3.22 mmtool I deleted the 06a4 module from the 435mt and added that 06c2 module. Rom is ready to flash. Chip arrives probably in a week so I have a week or 2 to think about what could go wrong and how to recover. Anyone done this before? Got any suggestions? Thanks for looking!