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 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.
Generations
Hynix GDDR SDRAM
A Samsung GDDR3 256MBit package
A 512 MBit Qimonda GDDR3 SDRAM package
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 Mb memory chip by Samsung Electronics in 1998.[1]
GDDR2
Main article: GDDR2 SDRAM
GDDR3
GDDR4
GDDR5
GDDR6
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 |
| 64 lanes | GDDR6X | ||||
See also
References
- "Samsung Electronics Comes Out with Super-Fast 16M DDR SGRAMs". Samsung Electronics. Samsung. 17 September 1998. Retrieved 23 June 2019.
- "GRAPHICS DOUBLE DATA RATE (GDDR5) SGRAM STANDARD JESD212C". JEDEC. 2016-02-01. Retrieved 2016-08-10.
- "GRAPHICS DOUBLE DATA RATE (GDDR5X) SGRAM STANDARD JESD232". JEDEC. 2015-11-01. Retrieved 2016-08-10.
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