This album shows some single player VRAM usage numbers at the Alliance garrison in Shadowmoon Valley. You can subtract ~430MB off of those numbers since my idle desktop eats up that much before loading up the game client.
They're all 2560x1440 (based off of the monitor you've purchased) and they're without any anti-aliasing. From the looks of it, and assuming you want to run a resolution somewhere in the ballpark of 2560x1440, you may have to mix and match your APIs since DX11 on 10 clients is likely going to use over 4GB of VRAM.
And yes, in that album, DX9 on Ultra was running terrible. I do suggest using DX11 these days whenever possible since you're bound to get better framerates, and you may have to end up disabling SSAO altogether since it tends to eat a lot of VRAM and GPU.
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