A-Tech 16GB (4 x 4GB) Max RAM for HP Compaq 6000 Pro - (Small Form Factor & Microtower) - DDR3 1066MHz PC3-8500 Non-ECC DIMM Memory Upgrade Kit at Amazon.com
2X Samsung M471B5673FH0-CF8 2GB DDR3 1066MHZ PC3-8500 Mac Memory (4GB Total RAM) at Amazon.com
Kingston Technology 4 GB Memory for Select Apple Imac's and Macbooks Single (Not a kit) 1066 MHz (PC3 8500) 204-Pin DDR3 SO-DIMM KTA- MB1066/4G at Amazon.com