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The notch on DDR2 DIMMs is in a different position from DDR DIMMs, and the pin density is higher than DDR DIMMs in desktops. DDR2 is a 240-pin module, DDR is a 184-pin module. Notebooks have 200-pin SO-DIMMs for DDR and DDR2; however, the notch on DDR2 modules is in a slightly different position than on DDR modules.
DDR2: 2003; DDR3: 2007; ... The first retail PC motherboard using DDR SDRAM was released in August 2000. ... Memory manufactured in this way is low-density RAM and is ...
Notch positions on DDR (top) and DDR2 (bottom) DIMM modules. On the bottom edge of 168-pin DIMMs there are two notches, and the location of each notch determines a particular feature of the module. The first notch is the DRAM key position, which represents RFU (reserved future use), registered , and unbuffered DIMM types (left, middle and right ...
Corresponding 240-pin DIMMs are known as PC2-3200 through PC2-6400. DDR2 SDRAM is now available at a clock rate of 533 MHz generally described as DDR2-1066 and the corresponding DIMMs are known as PC2-8500 (also named PC2-8600 depending on the manufacturer). Performance up to DDR2-1250 (PC2-10000) is available.
Memory: Up to 4GB (2 slots) DDR2; Graphics: NVIDIA GeForce 8400M GS (Video Memory - Up to 256 MB dedicated) Storage: 250 GB (5400 rpm) SATA HDD Optical Drive: LightScribe SuperMulti 8X DVD±RW with Double Layer Support; Display: 15.4” BrightView WXGA (1280 x 800) TN; Network: Ethernet 10/100BT integrated network interface; High speed 56K modem
The term rank was created and defined by JEDEC, the memory industry standards group.On a DDR, DDR2, or DDR3 memory module, each rank has a 64-bit-wide data bus (72 bits wide on DIMMs that support ECC).