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== SDR 168-pin SDRAM == [[File:Notch position between DDR and DDR2.jpg|thumb|right|upright=1.6|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 memory|registered]], and [[Unbuffered memory|unbuffered]] DIMM types (left, middle and right position, respectively). The second notch is the voltage key position, which represents 5.0 V, 3.3 V, and RFU DIMM types (order is the same as above).
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