Kingston ValueRAM 4GB Kit of 2 (2x2GB Modules) 1333MHz DDR3 ECC Reg CL9 DIMM SR x8 Intel Certified Server Memory KVR13R9S8K2/4I 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 Intel Certified