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It's not a huge leap from 1080 to 2070. Your talking 22 vs 27 transcodes for 10mbs 1080p to 4mbps 720p. At that point I would imagine you'd be hitting bandwidth constraints with a 1gb pipe before maxing out the card. 4k to 1080p are both a 6 transcodes, I think that's more of a ram limitation as both cards have 8gb.
I have a delidded 8700k oc'd at 5.3ghz and a 2080ti oc'd. This is a home gaming rig though. I meant more for only Plex transcodes, I don't think the op will see a big diff between 1080 and 2070. Nice setup btw!
While NVEnc has made some significant quality improvements when compared to previous generations of NVEnc, Intel's iGPU has been quite reasonable for 3-4 generations with only one notable change (H265 decode support being added). You don't see that many P2000/1060 owners complaining about quality, that said the jump up to the 20 series (where they actually got new NVEnc hardware) was noticeable, but that's relative to the 10 series, not intel iGPU. Ofcourse if you use an old iGPU (that's specifically advised against), you'll notice a difference, latest NV vs iGPU, not so much.
This is great info, also as a 2080ti owner, good to know about the knew nvenc. Also got a 9900k setup with a friend a day ago and I have to admit, I was impressed with it's gpu encoding. We did 4k to 4k transcoding (non hdr), it looked great and the cpu stayed under 5%. We kicked off 3 more 4k transcodes (for a total of 4, transcoding to various resolutions,) still stayed under 15%. I have to admit I was shocked, and happy. So I did the next logical thing and ordered my self a 9900k dedi.