Indeed it looks like right now the only people getting really good performance over land have 1.5-2 gb of vram. What this game really needs is a setup application that can check your settings against your vram and tell you if you are going over like in RoF and other games. I think if it had that a lot of people even before patching could get the game quite playable by manipulating the settings to stay under their vram limit.
Hopefully with patching they be able to get more effects on a smaller memory footprint.
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