Memory- Dual Channel DDR3 memory technology- 4 x DDR3 DIMM slots- Supports DDR3 2100(OC)/1866*/1800*/1600*/1333/1066/800 non-ECC, un-buffered memory- Max. capacity of system memory: 32GB***1866/1800/1600MHz memory speed is supported depend on the AM3/AM3+ CPU you adopt. For detail CPU specification, please refer AMD official website.**Due to the operating system limitation, the actual memory size may be less than 4GB for the reservation for system usage under Windows® 32-bit OS. For Windows® 64-bit OS with 64-bit CPU, there is no such limitation.官网的说明