OCZ DDR3 PC3-10666 1333MHz Intel Extreme Edition XMP Ready Series 6GB Triple Channel Kits Optimized for X58 Designed specifically for the Intel X58 chipset / Core i7 XMP Profile 1: 1333MHz 8-8-8-20 1.6* /XMP Profile 2: 1333MHz 7-7-7-20 1.6V* XTC Heatspreader**/1.65V EVP** 240 Pin DIMM/Unbuffered Available 3GB and 6GB Triple Channel Optimized kits