I used a 2012 15" unibody (non-retina) MBP with a Dell U3014E 30" monitor at 2560x1600, using an Apple mDP to Dual-link DVI adaptor meant for an Apple 30" Cinema Display.
No problems, but I didn't run it for extended periods of time, just an hour or two at a time.
I think it was running Mojave.
Old kit, nowadays, but I guess it means it should run a newer 1440p DP monitor?