Made from the highest quality components, ARCH MEMORY memory modules are designed to increase productivity and help your computer work faster. Arch Memory products are engineered to meet industry standard specifications and rigorously tested to ensure quality. Backed by free technical support, a lifetime warranty and legendary reliability, Arch Memory RAM is your best choice for upgrading your computer's memory.

Lenovo 4GB DDR2 SDRAM Memory Module - 4GB (2 x 2GB) - 667MHz DDR2-667/PC2-5300 - ECC - DDR2 SDRAM - 240-pin DIMM

Information technology professionals rely on HP quality to ensure maximum productivity. As the power of applications processors memory adapters and storage devices increases high-end computer users are seeking ways to optimize their system performance. HP provides leading solutions adding new levels of performance availability flexibility and management. Primary InformationRAM Type :  DRAM RAM Technology :  DDR 2 SDRAM RAM / Memory Speed :  667 MHz RAM / Storage Capacity :  4 GB Slot(s) Required :  2 x memory Registered  UNSPSC CodeUNSPSC Code :  32101602  Product IDUPC:  882780982 291Manufacturer Part:  408853-S21

Kingston 2GB 256M x 64-Bit DDR2-667 CL5 240-Pin DIMM Memory Module Features: Clock Cycle Time 3ns(min)/8ns(max) Minimum Row Cycle Time of 54ns Refresh To Active/Refresh Command Time of 127.5ns Row Active Time 39ns(min)/70,000ns (max) Single Power Supply of +1.8V 2.225W of Power while operating 94V-0 UL Rating

Mac RAM Direct is a Tier One manufacturer and supplier of Premium RAM memory products to the Apple community around the world. We are a government certified ISO 9001:2000 memory producer as well as a Registered Apple Developer. We supply Government agencies, Universities, Graphics, Audio and Video Professionals in 32 counties. We offer Mac users our premium HyperVelocityTM high performance memory modules as well as the Apple original OEM Samsung, Nanya and Hynix components for users that only want Apple exact parts. As an industry leader for the past 12 years we have learned that above all else, quality is the key to growth and success. All Mac Ram Direct parts are extensively tested before shipping out and combined with our Full Lifetime Replacement Warranty we deliver the peace of... Less