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.

Hynix GDDR SDRAM

Generations

See also: Synchronous dynamic random-access memory § Timeline

DDR SGRAM

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

Main article: GDDR2

GDDR3

Main article: GDDR3 SDRAM

GDDR4

Main article: GDDR4 SDRAM

GDDR5

Main article: GDDR5 SDRAM

See also: GDDR5X

GDDR6

Main article: GDDR6 SDRAM

Table of transfer rates

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

• Double data rate

References

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.