The problem is your video card. I failed to notice it is a 6570. Those aren't very fast and I've run a search and seen people with 6570s having that same problem. You have 128bit GDDR3. Also, that much memory is really a waste. I would spring for at least a 6850 or a 5770. Don't go more than 1GB and make sure it's 256bit GDDR5.
Actually, the memory of a dedicated GPU is not counted in that. The memory on a video is addressed separately by the video card as it's the only thing utilizing it. Only the system memory is an issue there and he's addressing all of it.