DDR3 memory modules from Samsung, M393B5673EH1-CF8 RDIMM ECC with a total capacity of 2GB each. The modules have a bus speed of PC3-8500 (DDR3-1066) and a pin count of 240. These memory modules are designed for servers and not suitable for desktop PCs. They were removed from a fully functioning server during an upgrade. 2 sets available sold in a set of 4.