ONE OR TWO CHANNEL OF UNBUFFERED DDR3 MEMORY WITH A MAXIMUN OF TWO UDIMMS PER CHANNEL. SINGLE AND DUAL CHANNEL TRANSFER RATES OF 1066 MT/S AND 1333 MT/S 64-BIT WUDE CHANNELS. DDR3 I/O VOLTAGE OF 1.5V. MAXIMUM MEMORY BANDWITH OF 10.6 GB/S UB SUNGLE-CHANNEL MODE OR 21 GB/S IN DUAL CHANNEL MODE ASSUMING DDR3 1333 MT/S