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DDR-3 SDRAM or Double Data Rate type Three Synchronous Dynamic Random Access Memory is a successor to DDR & DDR2. As compared to DDR2 SDRAM, it has ability to transfer data at double rate; i.e., eight times the speed of its internal memory arrays; thus enabling higher bandwidth (peak data rates). It has two transfers per cycle of a quadrupled clock signal; that enables it to achieve a transfer rate of up to 64 times the memory clock speed.

DDR2 SDRAM modules use DDR architecture to achieve high-speed operation. DDR2 architecture is basically an 8n-prefetch architecture which transfers two data words per clock cycle at the input-output pins. Initially it was launched with 1.5v DDR2 DRAM; later DDR2 DRAM works at 1.35v. 1.35v is usually compatible with all 1.5v platforms. Long-DIMM (or Desktop RAM) comprises of 240 connector pins, whereas SO-DIMM (Laptop RAM) comprises of 204 connector pins. Long DIMM of both DDR2 and DDR2 has 240 pins, but they can easily be identified as their notch location of DDR2 is nearer to pin 1 as opposed to DDR2 Long-DIMM. It typically has data transfer rates of PC3-6400 (800MT/s), PC3-8500 (1066MT/s), PC3-10600 (1333MT/s), PC3-12800 (1600MT/s), or PC3-14900 (1866MT/s).

2GB-DDR2 long dimm
ItemCode SDRAM CapacityDIMM MHz Buffer ECC PIN PC-Speed CL ns Module Density DQ
DLD2GD2-80 DDR2 2GB Long 800 Un-BufferedNon-ECC 240 PC2-6400 6 2.5 256Mx64bit x64
DSD2GD2-80 DDR2 2GBSO 800 Un-Buffered Non-ECC 200 PC2-6400 6 2.5 256Mx64bit x64
DLD2GD2-66 DDR2 2GB Long 667 Un-Buffered Non-ECC 240 PC2-5300 5 3 256Mx64bit x64
DSD2GD2-66 DDR2 2GB SO 667 Un-Buffered Non-ECC 200 PC2-5300 5 3 256Mx64bit x64

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