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The Signature Series 4GB DDR3 PC3-12800 1600 MHz SODIMM Memory Module from Patriot offers quality, reliability, and performance to meet all your computer memory needs. This 4GB module is designed to run at PC3-12800 (1600 MHz) at CAS 11 latency timings. The module has low power reuirement of 1.35V to save the battery life. Built using specific build-of-materials (BOMs), the module meets and exceeds industry standards, offering you a hassle-free upgrade.