A-Tech 4GB (2 x 2GB) RAM for HP Compaq 4000 Pro & 6000 Pro - (Small Form Factor & Microtower) - DDR3 1066MHz PC3-8500 Non-ECC DIMM Memory Upgrade Kit at Amazon.com
Bewinner RAM DDR3 PC12800, 240Pin DDR3 2GB 1600Mhz Large Capacity Memory RAM Suitable for PC12800 DDR3 1600 Memory Computer at Amazon.com