Mushkin 991769 DDR3 UDIMM 4GB PC3-10666 9-9-9-24 NONE 1.5V Compatible Frequency This product is engineered to operate at the optimum frequency for compatibility with your system. Compatible Timings This product is programmed to use timings that offer maximum compatibility with your system and original memory. Lifetime Warranty Quality guaranteed - we offer a lifetime warranty on this product and genuine, unmatched service and support. Type: DDR3 Voltage: 1.5V Speed Spec: PC3-10666 Frequency: 1333MHz Capacity Kit Type: Module Module Size: 4GB Module Build: 512Mx64 Chipset Density: 256Mx8 Timings tCL: 9 tRCD: 9 tRP: 9 tRAS: 24 Cooling Technology Heatsink: None