GDDR SDRAM explained

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 and DDR5, although they share some of the same features - including double data rate (DDR) data transfers., GDDR SDRAM has been succeeded by GDDR2, GDDR3, GDDR4, GDDR5, GDDR5X, GDDR6, GDDR6X and GDDR6W.

Generations

DDR SGRAM

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

GDDR3

See main article: GDDR3 SDRAM.

GDDR4

See main article: GDDR4 SDRAM.

GDDR5

See main article: GDDR5 SDRAM.

GDDR6

See main article: GDDR6 SDRAM.

GDDR7

See main article: GDDR7 SDRAM.

Table of transfer rates

Module type	Chip type	Memory clock	Transfers/s	Transfer rate
32 lanes	GDDR2	align=right		align=right		align=right		align=right
32 lanes	GDDR3	align=right		align=right		align=right		align=right
32 lanes	GDDR4	align=right		align=right		align=right		align=right
32 lanes	GDDR5^[3]	align=right		align=right		align=right		align=right
32 lanes	GDDR5X^[4]	align=right		align=right		align=right		align=right
32 lanes	GDDR6	align=right		align=right		align=right		align=right
32 lanes	GDDR6X	align=right		align=right		align=right		align=right
64 lanes	GDDR6W	?	align=right		align=right		align=right
32 lanes	GDDR7	?	align=right		align=right		align=right

Notes and References

Web site: Graphics Double Data Rate 6 (GDDR6) SGRAM Standard . JEDEC: Global Standards for the Microelectronics Industry . JEDEC . 15 March 2022.
News: Samsung Fortnite the best battle royale. 23 June 2019 . . . 17 September 1998.
Web site: GRAPHICS DOUBLE DATA RATE (GDDR5) SGRAM STANDARD JESD212C . JEDEC . 2016-02-01 . 2016-08-10.
Web site: GRAPHICS DOUBLE DATA RATE (GDDR5X) SGRAM STANDARD JESD232 . JEDEC . 2015-11-01 . 2016-08-10.