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GDDR SDRAM

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{{Memory types}}

{{short description|Type of memory used on graphics cards}}

Graphics DDR SDRAM (GDDR SDRAM) is a type of synchronous dynamic random-access memory (SDRAM) specifically designed for applications requiring high bandwidth,{{cite web |title=Graphics Double Data Rate 6 (GDDR6) SGRAM Standard |url=https://www.jedec.org/standards-documents/docs/jesd250c |website=JEDEC: Global Standards for the Microelectronics Industry |publisher=JEDEC |access-date=15 March 2022}} 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. {{As of|2025}}, GDDR SDRAM has been succeeded by GDDR2, GDDR3, GDDR4, GDDR5, GDDR5X, GDDR6, GDDR6X, GDDR6W and GDDR7.

Generations

{{See also|Synchronous dynamic random-access memory#Timeline}}

File:ATI Radeon X1300 256MB - Hynix HY5DU561622CTP-5-5390.jpg|Hynix GDDR SDRAM

File:SAMSUNG@QDDR3-SDRAM@256MBit@K5J55323QF-GC16 Stack-DSC01234-DSC01284 - ZS-retouched.jpg|A Samsung GDDR3 256MBit package

File:Sapphire Ultimate HD 4670 512MB - Qimonda HYB18H512321BF-10-93577.jpg|A 512 MBit Qimonda GDDR3 SDRAM package

File:SAMSUNG@QDDR3-SDRAM@256MBit@K5J55323QF-GC16 Stack-DSC01340-DSC01367 - ZS-retouched.jpg|Inside a Samsung GDDR3 256MBit package

=DDR SGRAM=

GDDR was initially known as DDR SGRAM (double data rate synchronous graphics RAM). It was commercially introduced as a 16{{nbsp}}Mb memory chip by Samsung Electronics in 1998.{{cite news |title=Samsung Electronics Comes Out with Super-Fast 16M DDR SGRAMs |url=https://www.samsung.com/semiconductor/insights/news-events/samsung-electronics-comes-out-with-super-fast-16m-ddr-sgrams/ |access-date=23 June 2019 |work=Samsung Electronics |publisher=Samsung |date=17 September 1998}}

=GDDR2=

{{Main|GDDR2 SDRAM}}

=GDDR3=

{{Main|GDDR3 SDRAM}}

=GDDR4=

{{Main|GDDR4 SDRAM}}

=GDDR5=

{{Main|GDDR5 SDRAM}}

{{See also|GDDR5X}}

=GDDR6=

{{Main|GDDR6 SDRAM}}

{{See also|GDDR6X|GDDR6W}}

=GDDR7=

{{Main|GDDR7 SDRAM}}

Table of transfer rates

class="wikitable sortable"

! Module type !! Chip type !! Memory clock !! Transfers/s !! colspan=2 |Transfer rate

32 lanes

|GDDR2

|align=right |{{val|400

500|u=MHz}}

|align=right |{{val|0.8

1.0|u=GT/s}}

|align=right |{{val|25.6

32.0|u=Gbit/s}}

|align=right |{{val|3.2

4.0|u=GB/s}}
32 lanes

|GDDR3

|align=right |{{val|400

1000|u=MHz}}

|align=right |{{val|0.8

2.0|u=GT/s}}

|align=right |{{val|25.6

64.0|u=Gbit/s}}

|align=right |{{val|3.2

8.0|u=GB/s}}
32 lanes

|GDDR4

|align=right |{{val|868

1126|u=MHz}}

|align=right |{{val|1.7

2.3|u=GT/s}}

|align=right |{{val|55.6

72.1|u=Gbit/s}}

|align=right |{{val|6.9

9.0|u=GB/s}}
32 lanes

|GDDR5{{Cite web|url=http://www.jedec.org/standards-documents/docs/jesd212c |publisher=JEDEC |title=GRAPHICS DOUBLE DATA RATE (GDDR5) SGRAM STANDARD JESD212C |date=2016-02-01 |access-date=2016-08-10}}

|align=right |{{val|1000

2000|u=MHz}}

|align=right |{{val|4.0

8.0|u=GT/s}}

|align=right |{{val|128.0

256.0|u=Gbit/s}}

|align=right |{{val|16.0

32.0|u=GB/s}}
32 lanes

|GDDR5X{{Cite web|url=http://www.jedec.org/standards-documents/docs/jesd232 |publisher=JEDEC |title=GRAPHICS DOUBLE DATA RATE (GDDR5X) SGRAM STANDARD JESD232 |date=2015-11-01 |access-date=2016-08-10}}

|align=right |{{val|1000

1808|u=MHz}}

|align=right |{{val|8.0

14.5|u=GT/s}}

|align=right |{{val|256.0

462.8|u=Gbit/s}}

|align=right |{{val|32.0

57.9|u=GB/s}}
32 lanes

|GDDR6

|align=right |{{val|1375

2500|u=MHz}}

|align=right |{{val|11.0

20.0|u=GT/s}}

|align=right |{{val|352.0

640.0|u=Gbit/s}}

|align=right |{{val|44.0

80.0|u=GB/s}}
32 lanes

|GDDR6X

|align=right |{{val|1188

1438|u=MHz}}

|align=right |{{val|19.0

23.0|u=GT/s}}

|align=right |{{val|608.0

736.0|u=Gbit/s}}

|align=right |{{val|76.0

92.0|u=GB/s}}
64 lanes

|GDDR6W

|?

|align=right |{{val|22.0|u=GT/s}}

|align=right |{{val|1408.0|u=Gbit/s}}

|align=right |{{val|176.0|u=GB/s}}

32 lanes

|GDDR7

|?

|align=right |{{val|28.0

40.0|u=GT/s}}

|align=right |{{val|896.0

1280.0|u=Gbit/s}}

|align=right |{{val|112.0

160.0|u=GB/s}}

See also

References

{{reflist}}

{{DRAM}}

{{Graphics Processing Unit}}

Category:SDRAM

Category:Graphics cards

Category:South Korean inventions

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