http://uk.transcend-info.com/Products/MemList.asp?ModNo=478 Designed for desktop computer use- our JetRam memory modules are manufactured with true ETT grade- brand-name DRAM chips- which are required to meet Transcend’s stringent requirements for performance and stability- including rigorous testing in extreme environments. These modules offer a compelling combination of excellent compatibility and fully-tested reliability at an attractive price- which makes them the preferred upgrade memory choice of distributors and computer retailers. Before production- all materials used in the manufacturing process must first pass through strict qualification testing across many different platforms and operating system versions. Moreover- to assure ultimate cross-platform compatibility and stability- each module is tested in many different system configurations that include mainstream motherboards and popular software programs. Specifications: CAPACITY DRAM P/N DESCRIPTION 2GB 256Mx8 JM1600KLN-2G 2GB JM DDR3 1600 U-DIMM 1Rx8 4GB 512Mx8 JM1600KLH-4G 4GB JM DDR3 1600 U-DIMM 1Rx8 4GB 256Mx8 JM1600KLN-4G 4GB JM DDR3 1600 U-DIMM 2Rx8 8GB 512Mx8 JM1600KLH-8G 8GB JM DDR3 1600 U-DIMM 2Rx8