CPU Tray for Apple Mac Pro 2010 and 2012 5,1, Dual Xeon X5680 running at 3.33Ghz (12 physical cores and 24 threads). SMC 1.39f11. Important note: the SMC of your motherboard must match the SMC of the tray otherwise at worst the machine won't boot at all and at best the fans will run full speed all the time. This includes firmware updated 2009 4,1 machines, which have an SMC version f5 and will boot but fans will run at full speed. Not recommended! RAM is fully populated with 8x16GB for a total of 128GB RAM. You are buying the CPU tray only, not a complete computer.
eBay