For compare: I own similar CPU ( except the K ) i7-8700K (3.7-4.7) / 64Gig / 2080TI / 3840x1600 / near ultra / NO MODS. I have no real issues so far ( usually 40-60fps, except e.g. LFPG on ground ).
Its not necessary that you play in 720p ;)… amount of vector-data, etc are more important.
EDIT: I forgot to mention. I use the sync-core-mode. Kind of overcloacking. ALL Cores can in this way run at “Turbo” ( in my case 4.7 ) , which is normaly not the case.