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
Kingston Technology ValueRAM 16GB 1600MHz DDR3 ECC Reg CL11 DIMM DR x4 with TS Server Hynix A Desktop Memory KVR16R11D4/16HA at Amazon.com