I have a Radeon HD 5970, which, from what I understand is a dual core GPU with each core having access to 2048 MB of vram. I've had some trouble when playing games with the screen briefly freezing up, and so I recently installed performance monitor for skyrim to see if I could pin it down on something, and I noticed that skyrim seems to only be using right under 2000 MBs of vram, is there some reason it doesn't have access to the other 2000 mbs? And is there any way to give it access to them?