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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:
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).
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 ...
LIB—LIBrary; LIF—Low Insertion Force; LIFO—Last In First Out; LILO—Linux Loader; LIP—Loop Initialization Primitive; LISP—LISt Processing; LKML—Linux Kernel Mailing List; LM—Lan Manager; LOC—Lines of Code; LPC—Lars Pensjö C; LPI—Linux Professional Institute; LPT— Line Print Terminal; LRU—Least Recently Used; LSB ...
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, ISO 639-3 code for the Dhudhuroa language; Disarmament, demobilization and reintegration, a component of peace processes; DNA-damage response, for repairing damaged DNA; Double data rate, a data transfer strategy of a computer bus DDR SDRAM, a computer memory standard that uses double-data-rate transfers; DDr., title for a double doctorate ...
Libby is a mobile app that supports users in accessing library ebooks. It is a product of OverDrive, Inc. The app uses a user's library card number to connect to the user's library account and check out ebooks. Once books are checked out, the app serves as an ebook reader. [2]