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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 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 1600 MB/s peak (theoretical) bandwidth. Likewise, 12.8 GB/s transfer rate DDR3-1600 is called PC3-12800. Some examples of popular designations of DDR modules:
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 ...
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).
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 ...
On the black market, the exchange rate was about 5 to 10 Mark der DDR to one Deutsche Mark. In the mid-1980s, one could easily visit foreign currency exchange offices in West Berlin and purchase East German banknotes (in denominations of 50 and 100 Mark der DDR) at the rate of M 5 (East) = DM 1 (West).
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.
The Council of Ministers (Ministerrat der DDR) was the government of East Germany and the highest organ of the state apparatus. Its position in the system of government and its functions and tasks were specified in the Constitution as amended in 1974 as well as in the "Law on the Council of Ministers of the German Democratic Republic" of October 1972.