?Memory?: 16GB Kit Containing 2 x 8GB Modules, DDR3, U-DIMM(Unbuffered DIMM), PC3-10600u, 1333MHz, 240 Pins, 1.5 Volt, 2Rx8 Dual Rank, Non-ECC, CL9. ?Functionality?: A solid aluminum heat spreader enables fast heat dissipation, lowers hardware power consumption and efficiently dissipates heat from each module so that they consistently run at high clock speeds. ?Adaptability?: 1333MHz RAM can downclock to 1066MHz if your computer system specification only supports 1066MHz. ?Attention?: Compatible with all motherboards. In order to avoid disputes between the two parties, check the specifications of the device before purchasing. For example, computer motherboard model/RAM model/RAM slot/RAM frequency/maximum compatible memory capacity. ?Functionality Plug & Play?: Please contact our service staff if you have any questions, we will sort it out within 24 hours. Thanks for choosing us. Wish a happy shopping experience.