System RAM generally uses DDR4 memory although older computers will still be found with DDR3 RAM.
Tip: DDR stands for Double Data Rate, while the G in GDDR stands for Graphics.
What is RAM?
What are the use cases for RAM vs VRAM?
In comparison, VRAM is primarily designed to move very large amounts of data.
As such VRAM has a much wider memory bus which allows for much greater bandwidth.
DDR memory, prioritises low latency, whereas GDDR prioritises high-bandwidth.
The two technologies progress independently of each other.
GDDR5 is more closely related to DDR3 than it is to DDR4.