Mushkin 991573 DDR3 UDIMM 2GB PC3-8500 7-7-7-21 NONE 1.5V Type: DDR3 Voltage: 1.5V Speed Spec: PC3-8500 Frequency: 1066MHz Capacity Kit Type: Module Module Size: 2GB Module Build: 256Mx64 Chipset Density: 128Mx8 Timings tCL: 7 tRCD: 7 tRP: 7 tRAS: 21 Cooling Technology Heatsink: None