Hi. I recently bought two Xeon W5590 CPUs to upgrade my early-2009 Mac Pro, replacing the E5520 CPUs that were originally installed. When I swapped them out, the Mac Pro refused to boot - no startup chime, no video. I then tried a single W5590 in CPU socket A and it booted fine, so I tried the other one in there and that also booted fine. I then tried them both together again and ran into the same problem. Finally, I tried the original two E5520s just in case there was a problem with CPU socket B, but they also worked perfectly fine.
I know of other people who have done this same upgrade using the same CPUs, so it's not a case of the Mac Pro not supporting this model.
Has anyone had a dual CPU problem like this before? Seems strange that the CPUs work individually but not together.
There's some more info including pictures here: http://forums.macrumors.com/showthre...781908&page=11
I know of other people who have done this same upgrade using the same CPUs, so it's not a case of the Mac Pro not supporting this model.
Has anyone had a dual CPU problem like this before? Seems strange that the CPUs work individually but not together.
There's some more info including pictures here: http://forums.macrumors.com/showthre...781908&page=11
