Kingston KVR1333D3N9K2/4G 4GB 2 x 2GB PC3-10600U DDR3 1333 DC Desktop Memory Kit Brand: Kingston Model: KVR1333D3N9K2/4G Type: 240-Pin DDR3 SDRAM Dual Channel Kit Capacity: 4GB (2 x 2GB) Speed: DDR3 1333 (PC3 10600)