Re: Multiple Monitors on a HD 6870
A 6870 simply doesn't have enough horsepower to push 3x 1080p resultion while gaming. Crossfire 6870s could probably do it, you would have customize the settings from game to game, for example reduce the draw distance, turn down AA, and lower texture quality in some games, like BF3, but in games like the COD series it could run it at Max everything.
If you want to stay with a single card you'd be looking at least at a 7950 to push 3 monitors at HD resolution with playable framerates. A single 7970 still wouldn't be able to Max out BF3 with 3 monitors.
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