The Performance series is tuned for optimal latencies at extremely fast clock speeds on P55 based Core i5 or Core i7 systems. These modules are hand tested in the latest Core i7 motherboards in dual channel configuration to guarantee bone jarring performance. Each Performance series module is equipped with our advanced Chrome heatsink that is designed by our thermal engineers to wick away heat from the components more efficiently than traditional heatsinks, resulting in higher clock speeds. The Performance series is built expressly for extreme overclockers and gaming enthusiasts. Mfr Part Number: WP160UX4G9 Type: DDR3, Capacity: 4 GB (2X2G), Speed: PC12800 1600MHz, Size & Bit: 128M x 8, Pins: 240pin, ECC: No, Registered: No, CL 9-9-9-24, 1.65V With Heat Spreader, Dual Channel kit of 2.