I've recently upgraded my Mac Pro 1,1 to 4 x 4gb crucial ram, hd5770 ati radeon graphics card and 2 x x5355 processors. I did this in stages with the last being the processors. Ever since the processors were installed I've been experiencing regular Kernel panics where the machine will crash within 1-20 minutes of being turned on. Here's the latest log: I've repaired permissions and attempted a 10.6 re-install (kernel panic before it could finish). Sometimes the machine won't even start and I have to reset the logic board or do a pram reset so it turns on. I would like to try everything out before having to roll back to the old processors. Is there anything specific to the panic log I can do to fix this problem? Cheers.