Samsung M378B5273CH0-CK0 2Rx8 PC3-12800U Desktop Memory 2x4GB (8GB Total) Memory Type: DDR3 SDRAM; Capacity: 4GB each Pins: 240 Pin; Bus Type:PC-12800 Error Correction: Non-ECC; Cycle Time: 1.5ns Cas: CL11; Data Transfer Rate: 1600Mhz Memory Clock: 200Mhz; Rank: Rank 2; Voltage: 1.5