Mac Mini with Dell UltraSharp U2713H - Not Sharp
Over HDMI that machine can only do 1920x1200.
Need Thunderbolt or MiniDP->DP or DVI to get 2560x1440 according to EveryMac

&amp; those screens have more input options than you could ever need; I'd go miniDP to miniDP [or DP] as simplest solution.
That's what I use here on 2 of the same monitors - but I also double up with DVI-DVI on one screen, to toggle between 2 computers.