Quoted from Ericpinballfan:
At the time and now, your build date will determine your monitor.
ECLE and builds through 2015 had the lesser monitor. Come Hobbit and Dialed In had the 1080 one. Thus Ruby Red builds also have the newer monitors if Im not mistaken.
Im july 2013 build and I will say playing in the menu when i first got it i discovered this.
Its never really bothered me. You can see the difference when an ECLE sits next to a dialed in.
Very interesting. I still find it very strange. Its not like 1080 wasnt a thing in 2013.