I've got an Nvidia Surround setup (5760x1080) with an i7, 16GB DDR3, and one GTX 970. I'm getting about 30 fps on high settings. Things dip down a bit with huge explosions, but that's to be expected. All in all, not bad for one GPU and three monitors. I'll probably pick up another 970 for an SLI configuration to smooth things out.
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