Mushkin Enhanced Essentials 4GB 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model 991769 Cas Latency: 9 Voltage: 1.5V Timing: 9-9-9-24 Features: 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.