Kingston ValueRAM 16GB Kit (4 x 4GB) 1333MHz DDR3 ECC CL9 DIMM w/ TS Memory KVR1333D3E9SK4/16G Four 4GB modules of 1333MHz DDR3 Memory Specifically designed and tested for compatibility in various devices 240-pin Unbuffered DIMM From the industry leader in PC Memory Backed by a lifetime warranty and free technical support