Why would you want to be watching a movie while playing a game? 

Buy a blue-ray/4k player prob solved.

So EVGA's forum regarding 20 series GPU's is suggesting that I should just return my 2080 ti because it is useless in regards to 4k, and replace it with a blue ray player that does support 4k instead? That's how you solve problems? I didn't ask about setting up home theater's, I asked about my GPU and how running 1440p and 4k monitors simultaneously would affect performance. And the best nvidia control panel settings used in order to optimize performance. If there is anyone who has experience using this type of set up please let me know and, if possible, give me some helpful advise that pertains to GPU optimization and what your thoughts were when using a 1440p and 4k monitor simultaneously with a EVGA 2080 ti.

Thank you for your insight. I may just have to stick with my 1080p 240hz and set the 1440p aside. The 4k and 1080 seem to be a good pair. The scaling is just terrible having a 24" 1080 next to a 27" 4k. If I get too frustrated with this set up I may just have to put an itx board in and add another psu and make it a dual rig setup. 
 
I am just trying to keep a forum based on the actual content that it advertises. You can keep your so called "suggestions" to yourself, whether informative or not. I would rather be honest and straight forward with people than beat around the bush with nonsensical answers and questions regarding why my kid and I watch movies and play games together. I don't know about you, but for me forums like these are based on 'information sharing' in regards to specific topics. If my attitude hurt your feelings based on people posting on threads in order to undermine the original question without providing any helpful or useful information, I am sorry. It is just frustrating when this is my first time using this forum and no one can give an honest straightforward answer pertaining to their own experiences with the monitor set up in question. So good luck on providing "suggestions" to people when your feelings seem to get in the way of any useful knowledge you may have. I don't know if this is how all EVGA forums are but my past experiences with other pc based forums were much more enlightening.
I will post my experience regarding the 4k and 1440p set up on Monday or Tuesday when I can test it out for an extended period of time. Hopefully it will help others who have the same inquiry. 

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Definitely agree on the same refresh rate/resolution and size when using dual monitor set ups. However, I was able to run both 4k movies on my 4k monitor and play APEX at 144 fps on a 1440p monitor simultaneously with no problems on one system using my 2080ti FTW3. But the scaling was obnoxious when dragging from one screen to the next. So instead I opted to purchase a dual system adapter for the Phanteks p600s case. So my 4k is hooked up via HDMI to the ITX build strictly for movies while my main PC runs my games on the 1440p display. This set up definitely isn't ideal because I am used to using the extended displays. The best route to go with multiple monitor set ups is purchasing identical monitors and either forfeiting frame rates for quality or vice versa, across the board like "bp7178" posted. How did you like your ultrawide. I may buy myself one for Christmas. Any suggestions?

I run two side 24" 1080p 60hz Asus screens in vertical while my center screen is a 27" Dell 1440p 144hz (120hz being used atm for the sake of coil whine) and have no issues gaming in my center screen while playing a 1080p video to my left or right but it does slow down if there's a lot of stuff going on in game along with a bunch of tabs open and my background up the wazoo apps. lol  My system is a bit old but she does well for what I throw at her.