8GB MEMORY PC3-10600R Dural Rank HMT31GR7BFR4C-H9/HMT31GR7AFR4C-H9 8GB DDR3 (Double Data Rate Three) RAM Heat spreader attached, ECC Registered 240-pin, PC3-10600R, 1333 MHz Voltage: 1.5V, CL9, 2Rx4