CPU is weaksauce and can't handle it. Probably going to need 12 cores @ > 3GHz if you expect to run Ultra x10. This is the best I could do with a quick attempt:
Left/Right:
- x4 Clients Each (DX9)
- Good Preset w/ 2x MSAA (Low Water/Ground Clutter)
- Fore/Background FPS: 60/20
Middle:
- x2 Clients (DX11)
- Ultra Preset w/ 2x MSAA (Low Water/Ground Clutter)
- Fore/Background FPS: 60/20
Each monitor is being powered by it's own GPU and I'm using a custom CPU affinity assignment. I don't really like the ground being cluttered with foliage (not that it matters in the Trade District) nor do I really like the unpredictable load that the new water generates, so I set both of those to low.
The CPU only shows that it's at about 70%, but you'd never want to be running at 100% because that's where things normally start to bottleneck and cause stuttering. So, I essentially left ~30% of the CPU free (for now) for any loading of textures or the ridiculous amount of spell effects that could occur in a large-scale battle.
You could always drop the slave FPS down to 15 or 10 to free up some more CPU, or even get rid of their anti-aliasing and then crank up the main two clients to 4x or something -- This is where it comes down to what you (or whoever else) prefer as video settings, but the hardest hitters are Texture Resolution, Shadows, and View Distance.
Dual-GPU card or not, I don't see why there would be an issue. If you were wanting to split the load between the two GPUs on the 690 then that isn't possible.
The only time SLI wouldn't work in a game is if the game didn't have a profile for it (which is fairly rare these days and can sometimes be forced on), but the only thing that controls whether SLI is enabled or not is the setting in the nVidia control panel. I don't know what overclocking software you're using that shows only one GPU active, but I imagine either SLI is disabled or... you're reading it wrong? /shrug
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