LENOVO 67Y1389 COMP 4GB DDR3-1333MHZ ECC 1.5V DR UDIMMAddOn 4 GB DDR3 SDRAM Memory Module For Server 4 GB (1 x 4GB) DDR3 1333 PC3 10600 DDR3 SDRAM 1333 MHz Dual rank Memory CL9 1. 50 V OEM ECC Unbuffered 240 pin UDIMM Lifetime Warranty VPN: 67Y1389 AM SKU: RSC392419 UPC: 821455231593 4 GB of memory to heighten your computer's performance 1333 MHz speed with Unbuffered signal and CL9 latency to execute routine softwares at a steady pace 240 pin pin DDR3 SDRAM operates at an effective bus speed with