How much extra graphics horsepower do 3 monitors need as opposed to 1?

Originally I thought that with 3 monitors, you need 3x the power (let' s say 5870 = 3x 5750), but benchmarks say otherwise.

With an eyefinity setup, how does the necessary hardware scale with # of monitors?

Also, If I want to future-proof for gaming at 1920x1200 with 1 monitor, is a 5770 enough? If I have 3, will I be able to get by with a 5850?

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More about extra graphics horsepower monitors opposed
  1. Future proofing with a 5770 is not smart at that res, go for the 5850, go for 5870 if you want 2 more monitors.
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