Make an account so I could vouch. I use a radeon hd 5770, with a gb of video memory. I don't feel like screenie and uploading, so you'll have to take my work for it. Staring at a static scene it's 49 or 48 fps with default, and 55 with high, which should be 1024 mb of video memory. Give it a shot, this guy has found something.