PNY DDR3 4GB 1333MHz (PC3-10666) CAS 9 1.5V PC Memory Desktop Module (MD4096SD3-1333) Desktop PC Memory | Essential upgrade provides improved system performance and responsiveness DDR3 4GB Module 1333MHz (PC3-10666) CAS Latency 9 Voltage: 1.5V Trusted Brand: 30-Year Global Memory Leader Warranty & Tech Support - Lifetime Warranty with 24/7 U.S. Based Tech Support Memory capacity upgrade provides improved system performance and responsiveness Deliver all the productivity your PC has to offer with PNY Memory Easy installation, Free 24-hour Technical Support, and Lifetime Warranty! Helps prepare your PC for running Windows 7 Compatible with PC3-10600 (1333 MHz) systems