I have Rx 480 graphic card which has 8GB of VRAM, and I am running 64bit Windows 7. I haven't seen more than 4GB of VRAM allocated yet in any game I've played so far. Is there any weird limit in Windows 7 or what's going on? Everytime usage hits roughly 4GB, it gets purged and starts from zero. I don't get it. Am I missing anything?