Today we have added Complete dual CPU core processor trays featuring Two Quad Core CPU's for the Mac Pro 2009 version 4,1. These are a great upgrade to any quad core Mac Pro.
Dual CPU Trays can be found here
Full collection of Mac Pro parts can be found here
For the adventures these can be used (with some DIY no how) to upgrade your machine to a 12 core super computing beast.
You will need to update your firmware as discussed here https://forums.macrumors.com/threads/upgrade-mac-pro-4-1-to-5-1-efi.1894850/
You can then install new CPU's as outlined here
Two notes, First we assume no responsibility in damaged caused by trying an upgrade and second......Go with the D lidded CPU's, here at Part haven we find that we can successfully de lid a CPU 2 out 3 times successfully. Ruining a CPU is far cheaper than ruining a CPU Tray socket.
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