HP 2GB (1x2GB) DDR3-1600 MHz ECC RAM at Amazon.com
CMS 16GB (4X4GB) DDR3 12800 1600MHz ECC Registered DIMM Memory Ram Compatible with HP/Compaq Workstation Z620 Ddr3 Ecc Reg for Server Only at Amazon.com
Team 4GB Kit(4GB~2) DDR3 1600MHz (PC3-12800) Desktop Memory Modules ECO Package at Amazon.com
A-Tech 32GB KIT (2 x 16GB) for Asus Z Motherboard Series Z8NA-D6, Z8NA-D6C, Z8NH-D12 DIMM DDR3 ECC Registered PC3-12800 1600MHz Dual Rank Server RAM Memory at Amazon.com