1080ti: 7.6 G/S on grin29 win10 latest drivers, @+135 core +400 mem 75% power => quite good
1070: 4.5 G/S on grin29 win10 latest drivers, @+165 core +550 mem 75% power => quite good
RX480 (4 gb) & RX580 (8 gb) on Beam win10 18.5.1 drivers, @1300 & 1350 core give 12 & 13 sol/s => similar to lolMiner 0.7
(but my bios are tweaked for eth)
(just for info: grin31 on 11 GB 1080 ti gives 0.05 G/S, I don't know why...)
it seems much slower on grin pool side (tested on f2pool only, and it's not reject rate shown around 2% pool side)