Patriot Signature DDR3 8 GB (2 x 4 GB) CL11 PC3-12800 (1600MHz) SODIMM Notebook Memory Kit PSD38G1600SK PC3-12800 (1600MHz) Data Rate 204-Pin Dual in-line memory module Non-ECC Unbuffered Serial Presence-Detect (SPD) RoHS and JEDEC Compliant 100% Tested. Free technical support and Lifetime Warranty