Not entirely sure on that. I know a lot of people use Input Director with ISBoxer (Synergy has shown to cause issues) when using two different computers to play. I only multibox on one machine, but I've had ID installed for years so I can use both of my machines at once. I can't say that I've heard of many ID issues as of lately.
P-States are power states. Multiple monitors of different resolutions (or refresh rates) or having your cards in SLI will cause the main GPU to not downclock to its idle state. You can force it to downclock via third-party tools like nVidia Inspector, but if you don't remember to turn it back up when you begin to play you're going to realize very quickly that something is wrong. Years ago I was manually forcing power states on my cards so that they'd be idle when I wasn't playing games... that lasted about a week before I got tired of continuously forgetting to turn it back to its normal state and having my games load up at 3 FPS.
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1080x810 seems like an odd aspect ratio (1.33), you would get better visual quality on those screens if you tried to keep the AR as close to your main client's resolution as you can (1920/1080 = 1.78). Not to mention, if you ever felt like disabling ISBoxer's instant swapping and wanted the mouse cursors in each window to sorta line up, then the AR would need to be close to identical on each screen.
I think you need to just get your new GPU and see how it handles five clients @ 1920x1080 and then go from there.
Yes, you can disable instant swapping and scale your mouse cursor to fit to the windows.
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