From Wikipedia, the free encyclopedia
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,
[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. As of 2023
[update] , 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 16
Mb memory chip by
Samsung Electronics in 1998.
[2]
GDDR2
GDDR3
GDDR4
GDDR5
GDDR6
GDDR7
Table of transfer rates
Module type
Chip type
Memory clock
Transfers/s
Transfer rate
32 lanes
GDDR2
400–500 MHz
0.8–1.0 GT/s
25.6–32.0 Gbit/s
3.2–4.0 GB/s
32 lanes
GDDR3
400–1000 MHz
0.8–2.0 GT/s
25.6–64.0 Gbit/s
3.2–8.0 GB/s
32 lanes
GDDR4
868–1126 MHz
1.7–2.3 GT/s
55.6–72.1 Gbit/s
6.9–9.0 GB/s
32 lanes
GDDR5
[3]
1000–2000 MHz
4.0–8.0 GT/s
128.0–256.0 Gbit/s
16.0–32.0 GB/s
32 lanes
GDDR5X
[4]
1000–1808 MHz
8.0–14.5 GT/s
256.0–462.8 Gbit/s
32.0–57.9 GB/s
32 lanes
GDDR6
1375–2500 MHz
11.0–20.0 GT/s
352.0–640.0 Gbit/s
44.0–80.0 GB/s
32 lanes
GDDR6X
1188–1438 MHz
19.0–23.0 GT/s
608.0–736.0 Gbit/s
76.0–92.0 GB/s
64 lanes
GDDR6W
?
22.0 GT/s
1408 .0 Gbit/s
176.0 GB/s
32 lanes
GDDR7
?
28.0–40.0 GT/s
896.0–1280 .0 Gbit/s
112.0–160.0 GB/s
See also
References
GPU
Architecture Components Memory Form factor Performance Misc