SUPERMICRO Manufacturing numbers MBD-X7DCL-i-B; MBD-X7DCL-i-O, MBD-X7DCT-B, MBD-X7DCT-10G-B; MBD-X7DCT-10G-O, MBD-X7DCT-3-B; MBD-X7DCT-3-O, MBD-X7DCT-3F-B; MBD-X7DCT-3F-O
16GB Total memory using 2pc of  8GB PC2-5300 DDR2-667 Registered ECC DIMM.
Lifetime warranty for exchange. 
We don't use Generic modules to avoid incompatibility issues. 
Guaranteed to work or you get all of your money back including shipping.
IF YOU NEED ECC REG SINGLE RANK PLEASE EMAIL US
Features
Max Memory 48GB
Sockets 6 (3 banks of 2)
Compatible with Supermicro X7DCL-i, X7DCT, X7DCT-10G, X7DCT-3, X7DCT-3FMotherboards.
MODULES MUST BE ORDERED AND INSTALLED IN PAIRS for Dual Channel mode.

Mixing x4 and x8 modules is allowed, however not within the same bank.

Maximum configurations require a 64-bit operating system. s.