LENOVO 0A65733 COMP 8GB DDR3-1600MHZ ECC SRX4 RDIMMAddOn 8GB DDR3 SDRAM Memory Module 8 GB (1 x 8GB) DDR3 1600 PC3 12800 DDR3 SDRAM 1600 MHz Dual rank Memory CL11 1. 50 V ECC Registered 240 pin DIMM Lifetime Warranty VPN: 0A65733 AM SKU: RSC842165 UPC: 821455637395 8 GB capacity is enough to execute all memory hungry programs simultaneously 1600 MHz of memory speed with Registered signal and CL11 latency allows you to browse web, listen to songs and use routine software simultaneously 240 pin pin DDR3