Quick few question to the folding group, and wondered if anyone has come across the same problem. am in the middle of a 4P Opteron build with 4 6276 on a supermicro Board H8QGI-F on a 850w Psu.. When I add 3 Cpu's, It will post,(I have updated the bios to the lestest bios) However, when I add the 4th, It wont post at all, I know the all the Cpu's work, as I have changed the all over in each socket. it will post, when we have CPU in sockets 1,2 and 4....and will post when we have CPU in sockets 1,2 and 3. As you can see, I have all the power connectors connected, One via PCIe And also, whats the best OS to use when running all 4?