be quiet! Pure Power 11 600W
The pure power 11 is an alright unit, a bit too budget for a 2080 Super imo. It should work fine overall. Efficiency means nothing in terms of psu quality. The topology and component quality is in general more important. The pure power 11 acrf rather then the better performing and higher quality llc resonant controllers, it is dc to dc, so it's kinda alright.
Now, the main problem I see is that 6 cores really isn't acceptable anymore, many games use 4 cores and several games already use 6 or higher cores, this doesn't include windows, which also uses cores. It'll work out fine in many titles, but I'd be wary.
1440p 144hz won't happen,more like 100fps. You'll have to dial back the settings a bit to hit 144fps in non e-sport titles.
Honestly, it's a bit of a pickle, the psu is an alright budget unit but not suited for a 2080S, the motherboard has no vrm heatsinks, so any cpu upgrade may throttle, and the ram is limited to 2666 Mhz.
If you intend to stick with this platform, I'd get a fan, and rig it so that it's blowing air directly on the power delivery system(the little row of square chips above and left of the cpu socket), and then upgrade to a i7 8700 or 9700 if it's supported.