Ballistix Sport 32GB Kit (8GBx4) DDR3 1600 MT/s (PC3-12800) UDIMM 240-Pin Memory - BLS4KIT8G3D1609DS1S00 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