So I have just recently received a 2006 Mac pro with 2x2.66ghz (dual core) Intel xeons in them but have no intention of running Mac os on it and want to run windows. I was talking to one of my friends that knows Macs pretty well and he said that the best cpu that you can put in the thing it a Intel Xeon x5365 (a quad core 3.0ghz cpu) but is there anyway that I can put any other Lga 771chips on it or is it completely locked down to the CPUs that apple has designated for it to be able to run.