4GB DDR3 1333 M Hz desktop memory module from from Hyperam br&. PC3-10600 DDR3 RAM memory with 240 pins & CAS latency of CL9 (1.5). Unbuffered non-ECC memory upgrade designed for mainstream computer systems. This DDR3 memory from Hypertec is backed by Lifetime manufacturers warranty. Also suitable for use in dual channel setup, if purchased & installed in pairs.