What desktop wallpaper size do I need for two 1440p and 1080p panels combined?

[ManuKnife]

I've just bought two 27" monitors, they're being shipped now, one at 1440p and one at 1080p, I plan to use the 1440p for gaming and 1080p for media streaming, Skype, etc... Anyway. I know this will sound like a silly question but when designing a desktop wallpaper do I need to make it with a resolution of a 2560x1440 + a 1920x1080 monitor separately side-by-side or 5120x1440 (two 1440p monitors combined in length) or does it matter?

Just ask if I wasn't clear enough, any replies would be helpful.

 

[Suzuki@1473780084@1473780163]

Make sure it's 1440p wide all the way, then scale it in Windows. 1440p will remain untouched, but the 1080 will be overscanned, that's why you 'scale to fit'. It might not work, in which case you have to customize one in Photoshop.