Kingston Technology ValueRAM 4 GB 1333MHz DDR3 PC3-10600 ECC Reg CL9 DIMM SR x4 1.35V Hynix C Server Memory (KVR13LR9S4/4HC) One 4 GB module of 1333MHz DDR3 Memory Specifically designed and tested for compatibility in various devices 240-Pin Registered DIMM From the industry leader in PC Memory Backed by a lifetime warranty and free technical support