Apple Mac Pro 4,1 2009 A1289 CPU Tray 2 x 2.26 GHz Quad Core Intel Xeon * Read
This is not compatible with the 2010 / 2012 A1289 as the fans go nuts. CPU Tray 2 x 2.26 GHz Quad Core Xeon E5520. Apple Mac Pro "Eight Core" 2.26 (2009/Nehalem). Apple Mac Pro 4,1. This is non-negotiable.