Mac Pro 2009-2012 Repair (2009, 2010, 2011, 2012) - iFixit
How to Upgrade Mac Pro Memory (Early 2009/MacPro4,1): EveryMac.com
Amazon.com: A-Tech 32GB Kit (4x8GB) RAM for Apple Mac Pro Early 2009, Mid 2010, Mid 2012 (4-Core, 6-Core, 8-Core, 12-Core) | DDR3 1066MHz PC3-8500R ECC RDIMM 2Rx4 1.5V 240-Pin Registered DIMM Memory
Amazon.com: A-Tech 32GB Kit (4x8GB) RAM for Apple Mac Pro Early 2009, Mid 2010, Mid 2012 (4-Core, 6-Core, 8-Core, 12-Core) | DDR3 1066MHz PC3-8500R ECC RDIMM 2Rx4 1.5V 240-Pin Registered DIMM Memory
How To Upgrade Your Mac Pro Graphics Card | Alik Griffin
A-Tech for Apple 2GB DDR3 1067MHz / 1066MHz PC3-8500 SODIMM Memory RAM Module for MacBook, MacBook Pro, iMac, Mac Mini - (Late 2008, Early 2009, Mid 2009, Late 2009, Mid 2010) Models at Amazon.com
Memory Upgrades for Your 2009 - 2012 Mac Pro
8GB Kit (2 x 4GB) PC3-8500 RAM for Apple Mac Mini Early 2009 MB464LL/A
How to Install Memory (RAM) in an Early 2009 Mac Pro - YouTube
Mac Pro Early 2009 (4,1) Driving me insane | Page 2 | MacRumors Forums