4GB ( 1x 4GB Module ) DDR3 1600 MHz ( PC3-12800 ) DDR3 DIMM ( 240-Pin ) Non-ECC UDIMM ( Unbuffered DIMM ) 1.35V - DDR3 Low Voltage Compatible Equivalent for Crucial BLS2K4G3D1609ES2LX0 High performance Memory RAM upgrade designed for Desktop Computer Systems All modules undergo quality assurance testing to ensure dependable and reliable performance Please verify the supported memory (RAM) specifications of your system prior to purchase to ensure compatibility A-Tech provides a Lifetime Warranty for all orders & offers complimentary United States based Tech Support before, during, & after your purchase