How to Calculate the Memory Bandwidth for GDDR5 RAM

By Andrew Meer

Certain video card models by Nvidia and AMD use a type of video memory called GDDR5, which stands for Graphics Double Data Rate 5. The memory bandwidth of GDDR5 VRAM differs from each video card model. If you know the memory clock frequency and memory interface width of a video card’s GDDR5 VRAM, you can calculate its memory bandwidth immediately.

Step 1

Divide the memory interface width of the GDDR5 VRAM by eight.

Step 2

Multiply the answer with the memory clock frequency (in MHz) of the GDDR5 VRAM.

Step 3

Multiply the answer by two and then divide it by 1000 to get the memory bandwidth of the GDDR5 VRAM in gigabits.

Tips & Warnings

  • The formula for calculating GDDR5 memory bandwidth is "(Memory Clock) x [(Memory Interface) / 8] x 2."
  • You can find the memory clock and memory interface width of a video card’s GDDR5 VRAM at nvidia.com or AMD.com.