Full Details from Amazon.com : http://www.amazon.com/gp/product/B0083M3DK6?tag=onigi-20
Kingston Technology ValueRAM 4 GB Kit of 2 (2x2 GB Modules) 1333MHz DDR3 PC3-10666 ECC CL9
Kit of 2 2 GB 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
Intel Certified