Amazon.com: Silcon Power DDR3 4 GB 1600 Mhz Low-Voltage SO DIMM RAM Memory Module for Laptop : Electronics
OWC 24GB (3 x 8GB) PC8500 DDR3 ECC 1066MHz DIMMs Memory Compatible with Mac Pro Early 2009 & Late 2010 'Nehalem' & 'Westmere' Systems and Early 2009 Xserve (OWC85MP3W8M24K) at Amazon.com