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How to 3.46 GHz 12 Core Processor Upgrade a 2009-12 Mac Pro , revised with Northbridge repair and re-thermal pasting update . – Creation Machines , LLC
How to Upgrade Mac Pro Processor (Early 2009/MacPro4,1): EveryMac.com
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Mac Pro 2009 4,1 Delidded Upgrade Kit to 12-Core 3.46GHz Xeon X5690 CPU SLBVX | eBay
Upgrading The Processors On My Early 2009 Mac Pro At A Bargain Price | ErikNaso.com