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Graphics DDR SDRAM (GDDR SDRAM) is a type of synchronous dynamic random-access memory (SDRAM) specifically designed for applications requiring high bandwidth,[1] e.g. graphics processing units (GPUs). GDDR SDRAM is distinct from the more widely known types of DDR SDRAM, such as DDR4, although they share some of the same features—including double data rate data transfers. As of 2018, GDDR SDRAM has been succeeded by GDDR2, GDDR3, GDDR4, GDDR5, GDDR5X, GDDR6, and GDDR6X.



GDDR was initially known as DDR SGRAM (double data rate synchronous graphics RAM). It was commercially introduced as a 16 Mb memory chip by Samsung Electronics in 1998.[2]


Main article: DDR2 SDRAM





Table of transfer rates[edit]

Module type Chip type Memory clock Transfers/s Transfer rate
? GDDR2 500 MHz ? 128 Gbit/s 16.0 GB/s
64 lanes GDDR3 625 MHz 2.5 GT/s 159 Gbit/s 19.9 GB/s
64 lanes GDDR4 275 MHz 2.2 GT/s 140.8 Gbit/s 17.6 GB/s
64 lanes GDDR5[3] 625–1125 MHz 5–9 GT/s 320–576 Gbit/s 40–72 GB/s
64 lanes GDDR5X[4] 625–875 MHz 10–12 GT/s 640–896 Gbit/s 80–112 GB/s
64 lanes GDDR6 875–1125 MHz 14–18 GT/s 896–1152 Gbit/s 112–144 GB/s
64 lanes GDDR6X 594–656 MHz 19–21 GT/s 1216–1344 Gbit/s 152–168 GB/s

See also[edit]


  1. ^ "Graphics Double Data Rate 6 (GDDR6) SGRAM Standard". JEDEC: Global Standards for the Microelectronics Industry. JEDEC. Retrieved 15 March 2022.
  2. ^ "Samsung Electronics Comes Out with Super-Fast 16M DDR SGRAMs". Samsung Electronics. Samsung. 17 September 1998. Retrieved 23 June 2019.
  3. ^ "GRAPHICS DOUBLE DATA RATE (GDDR5) SGRAM STANDARD JESD212C". JEDEC. 2016-02-01. Retrieved 2016-08-10.
  4. ^ "GRAPHICS DOUBLE DATA RATE (GDDR5X) SGRAM STANDARD JESD232". JEDEC. 2015-11-01. Retrieved 2016-08-10.