Video RAM: What’s the difference between the types available today?
All graphics cards need both a GPU and VRAM to function properly. While the GPU (Graphics Processing Unit) does the actual processing of data to output images on your monitor, the data it is processing and providing is stored and accessed from the chips of VRAM (Video Random Access Memory) surrounding it.
Outputting high-resolution graphics at a quick rate requires both a beefy GPU and a large quantity of high-bandwidth VRAM working in tandem. For most of the past decade, VRAM design was fairly stagnant, and focused on using more power to achieve greater VRAM clock speeds.