I’m considering upgrading an older HDMI 1080 display to a 4k display that has display port as an option for a better iPad experience. That said, I’m also occasionally using an older 2012 MacMini. Will the Mac, via hdmi, be able to drive that display but at a lower resolution?
Per the spec page, it should be able to output up to 2560 x 1600 (or 2560 x 1440 depending on aspect ratio) on that display. It won’t look great but I believe it should work fine. I might make sure you have a good return policy and test early just to be certain.
Note, I say this having plugged in older machines (non-mac) into my 5k display and seeing this behaviour. That’s what’s giving me some confidence. I haven’t tried your specific situation.
Make sure for the iPad you use the shiftscreen 4X app
The mini will work fine on 2560*1600 which I used to drive it on on my old 30" Dell Screen. The Displays App will allow you to manage resolutions from menu bar to find one that works best on your screen.
Up to 2560 by 1600 (Thunderbolt/mini display port) or 1920 by 1200 (HDMI)