8GB Total memory using 2pc of 4GB 1600MHz Module 240pin dimm DDR3 8500. Also 1333mhz will work Supports DDR3 2200 (OC) ***/1600/1333/1066 non-ECC, un-buffered memory(DDR3 1600 with Intel® Ivy Bridge CPU, DDR3 1333 with Intel® Sandy Bridge CPU) 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. MAX MEMORY 64GB SOCKETS 4 COMPATIBLE WITH ASRock Motherboard 970 Extreme 3, 970 Extreme4