Presumably you mean 32GB RAM on the machine, not the card?
So you have 8 or 6 on the GPU?
The default the system starts with is 1GB, so you will need to increase it to the size of your VRAM. You can also put this in an engine ini file, to save you typing it every time you start the edtior.
Textures is the main thing that will push VRAM through the roof.