How to Upgrade Mac Pro Processor (Early 2009/MacPro4,1): EveryMac.com
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Mac Pro 4,1 Dual CPU Processor Board Complete 2009 Apple 630-9402
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MacPro 4,1 W3540 2.9 to MacPro 5,1 W3580 3.3 Upgrade - Step by Step Shots - Success! | MacRumors Forums
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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
2009 Mac Pro CPU & RAM Upgrade to 12 Core - 4,1 to 2010 5,1 Firmware - YouTube
Upgrading Mac Pro 4,1 to 2 x 3.46ghz (X5690) | MacRumors Forums
Upgraded Early 2009 4,1 Apple Mac Pro Tray to DUAL 12 CORE CPU 3.46GHz X5690s | eBay
The differences between the 4,1 and 5,1 Mac Pro - The House of Moth
2009 Mac Pro CPU Replacement (quad-core) - iFixit Repair Guide
Frying a Mac Pro - Upgrading and Analyzing Apple's Nehalem Mac Pro
