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DDR SDRAM specification was finalized by JEDEC in June 2000 (JESD79). [9] JEDEC has set standards for the data rates of DDR SDRAM, divided into two parts. The first specification is for memory chips, and the second is for memory modules. The first retail PC motherboard using DDR SDRAM was released in August 2000. [10]
DDR SDRAM popularized the technique of referring to the bus bandwidth in megabytes per second, the product of the transfer rate and the bus width in bytes. DDR SDRAM operating with a 100 MHz clock is called DDR-200 (after its 200 MT/s data transfer rate), and a 64-bit (8-byte) wide DIMM operated at that data rate is called PC-1600, after its ...
East Germany (German: Ostdeutschland [ˈɔstˌdɔʏtʃlant] ⓘ), officially known as the German Democratic Republic (GDR; Deutsche Demokratische Republik [ˈdɔʏtʃə demoˈkʁaːtɪʃə ʁepuˈbliːk] ⓘ, DDR [ˌdeːdeːˈʔɛʁ] ⓘ), was a country in Central Europe from its formation on 7 October 1949 until its reunification with West ...
DDR SDRAM (sometimes called DDR1 for greater clarity) doubles the minimum read or write unit; every access refers to at least two consecutive words. Typical DDR SDRAM clock rates are 133, 166 and 200 MHz (7.5, 6, and 5 ns/cycle), generally described as DDR-266, DDR-333 and DDR-400 (3.75, 3, and 2.5 ns per beat).
DDR or ddr may refer to: Dance Dance Revolution, a musical video game series produced by Konami; Deutsche Demokratische Republik, 'German Democratic Republic ...
The German Democratic Republic (GDR), German: Deutsche Demokratische Republik (DDR), often known in English as East Germany, existed from 1949 to 1990. [1] It covered the area of the present-day German states of Mecklenburg-Vorpommern, Brandenburg, Berlin (excluding West Berlin), Sachsen, Sachsen-Anhalt, and Thüringen.
Double data rate SDRAM (DDR SDRAM or DDR) was a later development of SDRAM, used in PC memory beginning in 2000. Subsequent versions are numbered sequentially (DDR2, DDR3, etc.). DDR SDRAM internally performs double-width accesses at the clock rate, and uses a double data rate interface to transfer one half on each clock edge. DDR2 and DDR3 ...
DDR4 speeds are advertised as double the base clock rate due to its Double Data Rate (DDR) nature, with common speeds including DDR4-2400 and DDR4-3200, and higher speeds like DDR4-4266 and DDR4-5000 available at a premium. Unlike DDR3, DDR4 does not have a low voltage variant; it consistently operates at 1.2 V. Additionally, DDR4 improves on ...