VRAM is what's used inside a GPU. The purpose of VRAM is to hold the information as you do operations on it. For a processing unit to load data from your regular RAM versus a specialized memory like VRAM is orders of magnitude slower, and you're sometimes better off just running it on the CPU at that point. The difficult thing is that the tech used for VRAM is more expensive to expand than regular RAM, so it's not cost effective to have gigabytes upon gigabytes of it.
VRAM is what's used inside a GPU. The purpose of VRAM is to hold the information as you do operations on it. For a processing unit to load data from your regular RAM versus a specialized memory like VRAM is orders of magnitude slower, and you're sometimes better off just running it on the CPU at that point. The difficult thing is that the tech used for VRAM is more expensive to expand than regular RAM, so it's not cost effective to have gigabytes upon gigabytes of it.