Patriot Signature DDR3 4 GB (2 x 2 GB) CL9 PC3-12800 (1600MHz) 240-Pin DDR3 Desktop Memory Kit PSD34G1600K PC3-12800 (1600MHz) Data Rate 240-Pin Dual in-line memory module for Desktop PCs 4GB (2 x 2GB) Non-ECC Unbuffered kit 100% Tested and compliant with RoHS standards Lifetime Warranty