Patriot Signature 4GB DDR3 PC3-12800 1600MHz CL11 SODIMM Desktop Memory PSD34G160082S PC3-12800 (1600MHz) Data Rate 204-Pin Dual in-line memory module Non-ECC Unbuffered 2 Rank module 7.8US Refresh Interval (8192 CY CLES/64MS) 1.5V Power Requirement Auto and self refresh capability PCB height: 1.18 in