G.SKILL Ripjaws X Series 16GB (4 x 4GB) 240-Pin DDR3 SDRAM Desktop Memory F3-17000CL11Q-16GBXL (Non-ECC, Unbuffered) Intel XMP (Extreme Memory Profile) Certified for Intel Z68, Intel P67 Chipsets CAS Latency: 11-11-11-30-2N Capacity: 16GB (4GB x4) Speed: DDR3-2133 (PC3 17000) Type: 240-pin DIMM, Non-ECC, Unbuffered, 1.6 Volts