People are going to see the first post and respond to that instead of reading your question.
I tend to use Anandtech for benchmark comparisons like these. If you plan on running DX11 with at least some
good looking video settings across 5 clients you're going to need at least 1.5GB of VRAM on the higher end
cards. If you decide to go with the GTX 580 they make a 3GB model that I've done plenty of testing with and
would recommend. I'm assuming we're talking about WoW here even though games like RIFT take up a good
amount of VRAM as well when you start increasing video settings.
http://www.anandtech.com/bench/Product/292?vs=305
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