16GB Total memory using 2pc of 8GB 1333MHz Module 240pin dimm DDR3 8500. Also 1333mhz will work Supports DDR3 2000 (OC) /1866*/1800*/1600*/1333/1066/800 non-ECC, un-buffered memory Lifetime warranty for exchange by Computer Memory Solutions Brand Computer Memory Solutions We don't use Generic modules to avoid incompatibility issues. Guaranteed to work or you get all of your money back including shipping. MAX MEMORY 16GB SOCKETS 2 COMPATIBLE WITH ASRock Motherboard A75M-ITX, B75M, B75M R 2.0, B75M-DGS