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DDR-1, also known as DDR (Dual Data Rate) was a revolution in DRAM technology. It doubled the bandwidth, and improved performance of SDR SDRAM technology. DDR enables transfer of data on both rising and falling edges of a clock signal. DDR still continues to be ideal choice for many new designs, we foresee its use and thus would provide support for as long as possible.

DDR SDRAM technology uses double data rate architecture to achieve high-speed operation.  It is a 2n-prefetch architecture which can transfer two data words per clock cycle at the input-output pins.  It also consumes less power at 2.5v as compared to its predecessor SDR SDRAM which requires 3.3v. Long-DIMM (or Desktop RAM) comprises of 184 connector pins, whereas SO-DIMM (Laptop RAM) comprises of 200 connector pins.  It typically has a Fast data transfer rates: PC2100 (266MT/s), PC2700 (333MT/s), or PC3200 (400MT/s).

512MB DDR1 400MHz long dimm
SDRAM Capacity Buffer ECC PIN DIMM MHz PC-Speed CL ns Module Density DQ
DDR1 512MB Un-Buffered Non-ECC 184 Long 400 PC-3200 3 18 64Mx64bit x64

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