DDR2 for Servers
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Samsung DDR2 for Servers Fully Buffered and Registered DIMMs Support Maximum Bandwidth and Fast Data Access DDR2 Features Optimize Server Performance The need for increased server performance is unrelenting, thus DDR2 SDRAM is now the high-density standard for server main memory. Its advanced architecture gives DDR2 a host of advantages over earlier standards, such as faster speeds, better signal integrity, lower power consumption and better thermal characteristics. With the industry's broadest product selection, Samsung offers DDR2 as registered, parity-regis-tered, very-low-profile-registered and fully buffered modules in densities up to 8GB and in a range of speeds and configurations to support the needs of performance-conscious users. Many of DDR2's key features are optimal for servers. For example, DDR2's higher-density memory capabilities ce higher peak bandwidth and support twice the data transfer rate of DDR333. Another DDR2 advantage is increased memory support because FBDIMMs allow up to eight modules per channel compared to three with DDR. In addition, the lower power consumption and reduced heat of DDR2 are ideal for blade and rack servers where air flow may be limited. FB DIMMs for Maximum Density Samsung Fully Buffered DIMMs (FBDIMMs) give servers the highest possible memory density and bandwidth. Servers equipped with FBDIMMs can get up to 64 gigabytes per channel of total system memory, with the architectures increased number of memory channels delivering up to 21.2GB/second of memory bandwidth. In addition, FBDIMMs deliver exceptional reliability. Most notable is a silent data error rate of one per 100 years or less, enabled by a robust CRC scheme that protects both commands and data. Also boosting reliability are features such as transient bit-error detection and retry and "bit-lane fail-over correction." This enables the server board to shut down a bad data path on the fly. Optional bit widths and CRC coverage are applicable to a wide range of server applications. Outstanding Power Advantages Power usage is rapidly increasing in importance but servers equipped with high-density FBDIMMs have strong advantages. For example, 2Gb-based 8GB FBDIMMs provide today's most energy-efficient high-density server soluͭtion. Compared to 1Gb-based FBDIMMs, the higher-density modules make possible server main memory configurations that require half the number of DIMMs while achieving the same overall density. (See chart below.) This is made possible because four 8GB modules using 2Gb components consume 47% less power than eight 1Gb-based modules. Samsung's broad line of high-density memory modules delivers the ultimate in computing power, flexibility and performance for servers. 2GB-BASED FBDIMM POWER ADVANTAGE 8GBx4pcs (2Gb, ^ 4GBx8pcs Samsung's 2Gb-based FBDIMMs have significant power advantages, enabling server configurations that deliver the same power and voltage as 1Gb-based FBDIMM modules but consuming 47% less energy because only half the number of modules are required. In this case, two different configuration that achieve 32GB of main memory are pictured.

DDR2 SDRAM Registered Modules DDR2 SDRAM Fully Buffered Modules Samsung's lower-power DDR2 DIMMs produce less heat, making them ideal for blade and rack servers. Density Composition Speeds (Mbps) Rank 512MB (64M x8)*9 400/533/667/800 1 1GB (128M x4)*18 400/533/667/800 1 1GB (64M x8)*18 400/533/667/800 2 1GB (128Mx8)*9 400/533/667/800 1 2GB (128M x4)*36 400/533/667/800 2 2GB (256M x4)*18 400/533/667/800 1 2GB (128M x8)*18 400/533/667/800 2 4GB st. (512M x4)*18 400/533/667/800 2 8GB st. (512Mx4)*36 400/533/667/800 4 Density Composition Speeds (Mbps) Rank 512MB (64M x8)*9 667/800 1 1GB (64M...