GDDR SDRAM

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Hynix GDDR SDRAM

Graphics DDR SDRAM (GDDR SDRAM) is a type of synchronous dynamic random-access memory (SDRAM) specifically designed for graphics processing units (GPUs). GDDR SDRAM is distinct from the more widely known types of DDR SDRAM, such as DDR3, 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, and GDDR6.

Generations[edit]

DDR SGRAM[edit]

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.[1]

GDDR2[edit]

GDDR3[edit]

GDDR4[edit]

GDDR5[edit]

GDDR6[edit]


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[2] 625–1000 MHz 5–8 GT/s 320–512 Gbit/s 40–64 GB/s
64 lanes GDDR5X[3] 625–875 MHz 10–12 GT/s 640–896 Gbit/s 80–112 GB/s
64 lanes GDDR6 875–1000 MHz 14–16 GT/s 896–1024 Gbit/s 112–128 GB/s

See also[edit]


References[edit]

  1. ^ "Samsung Electronics Comes Out with Super-Fast 16M DDR SGRAMs". Samsung Electronics. Samsung. 17 September 1998. Retrieved 23 June 2019.
  2. ^ "GRAPHICS DOUBLE DATA RATE (GDDR5) SGRAM STANDARD JESD212C". JEDEC. 2016-02-01. Retrieved 2016-08-10.
  3. ^ "GRAPHICS DOUBLE DATA RATE (GDDR5X) SGRAM STANDARD JESD232". JEDEC. 2015-11-01. Retrieved 2016-08-10.