Delidded Pair X5680 3.33GHz XEON CPU Mac Pro 4,1 upgrade kit

Delidded Pair X5680 3.33GHz XEON CPU Mac Pro 4,1 upgrade kit This kit has: * 2 delidded Intel Xeon X5680 CPUs * 1 3mm Hex t-key wrench (To remove and reinstall heatsink) * 1 High quality thermal paste * 2 Chem pads (To clean CPU and heatsink) Install guide: https://www.youtube.com/watch?v=Et29f4uTLPs Only intended for Mac Pro 2009 dual CPU model. Need upgrade to 5,1 firmware before install. Check  https://www.ifixit.com/Guide/How+to+Upgrade+the+Firmware+of+a+2009+Mac+Pro+41/98985 Note that different from many sellers, this product has CPU die like a mirror. No residues of solder, thus much better thermal conduction. Note that for testing we used pencil eraser and then used 90% alcohol to clean the pin contacts before install. Just in case it cannot boot for you, the first thing I’d try is to clean them again. Any questions about installing it are very welcome.