Hello and welcome to the forums http://asus.com/product.aspx?P_ID=wurRaDZ8lo4Ckukj&templete=2
Memory: 6 x DIMM, Max. 24 GB, DDR3 2000(O.C.)*/1600/1333/1066 Non-ECC,Un-buffered Memory,Triple channel memory architecture
Also make sure the voltage is 1.65 or 1.6 or lower