you didnt get to experience geforce now version too much, but those 3.5 ghz cc150 4/8 cores choke in a lot of regions in the game:

https://www.youtube.com/watch?v=Dk4pbbfAhBU&feature=emb_title

so having an amazing ultra duper uber gpu does not help geforce now due to how horrible their cpu is

on the other hand, your 5820k 6/12 cores with cache dedicated to the entire cpu will surely handle the game without dropping below 45 in the majority of the game

sadly geforce now has to really update their cpus for increased cpu demands resulting from RTX (bhv structures). it also should be said that nvidia has extra driver headroom compared to amd gpus which makes the cpu bound situations even more atrocious

in the end, i also had the choice of playing with geforce now, but opted to go with my gtx 1080. instead, i chose high-ultra oriented settings and a lock of 45 fps and was content with what I got. i played for 80 hours and enjoyed every second of it. it does not have to be constant 60 fps all the time. honestly, i couldn't accept dropping to 900p, cyberpunk 2077 in its nature is already blurry, even at 1080p with some mild sharpening, the IQ was barely acceptable. i tried experimenting with 900p but sadly it was not my cup of tea. i chose 1080p 45 fps instead of 900p 60 fps, to be exact