new version v21.2 with bug fixed.
Hash rate drops regulary on 2018 ti /undervolted/ on equal intervals - 10 seconds 2.03 g/s, 10 seconds 1.74 g/s wich is strange. No such drops with bminer or gminer.
Have you tried with stock settings?
Just tested it. It seems to hold little bit stable 2.10 - 2.14 g/s, but drops to 1.8 in longer intervals compared to undervolted card. Maybe it's power related or maybe it's normal, I dont know. I just expected to see relatively stable hash. But yeah, looks better not undervolted.
https://imgur.com/oCeKoVUit drops for me either on v21.2, grin 31, win 10 latest drivers, single gpu pc with core i7 (so it's not cpu related), 1080 ti max power @70% (base = 1.35 g/s, drops to 1.14 and rarelly to 0.95 g/s)
it didn't on v21.0 (was stable at 1.34 g/s)
edit: it's stable on v21.2 at 1.48 g/s @100% power load, but I don't want that...