1060 w/3GB RAM should do about that, maybe 21Mh/s if you get things just right. My Gigabyte card likes 70% power limit, about +220 GPU speed offset and +1000 memory offset. Not all cards will do that, I have Hynix VRAM, also. Some might get a little more, but I don't know of any way to set the memory more than +1000 offset. My card will hold a stable +240 GPU, but I get crappy shares relative to what I get at +220. Every single card is just a little different unless they came out of the same batch, same model from the same maker.
I have never seen such high OC settings for 1060 with Hynix memory. What specific model do you have and do you have any clue about the manufacturing date?
You can push the memory clock above +1000 MHz through Asus GPU Tweak (details:
http://bit.ly/2GHtYma, use translator).
Yep, I agree. I had a 3GB 1060 that went tits up, so I was looking for a reasonably priced replacment back around early December and was purposefully looking for a good OC'ing 6GB card. The one I picked had to fit in the tight spot the generic 3GB HP card came out of the Pavilion Power 580-023w I bought for $499 from Walmart around mid-October, since there's no extra room or spare slot, because I have a SoundBlaster SBX Pro "Z" in that rig. I selected the Gigabyte single fan "ICX" version, which is a good overclocker and a short slot (7,5" length) double wide jobbie. I patiently waited for the card to get under $300. Right now they are more like double that - when you can find one for sale.
The one I picked was a good runner in the silicon lottery derby, and I can easily run +240 with graphics programs and test / benchmark programs, but while I had been running +220 this week, it's been getting a slightly lower hash rate. I just cut it back to +215 for now to see how it rides, and it's steady as a rock.
Here's the new GPU-Z shot:

and my "nVidia Inspector" settings:

It rarely ever goes beyond 80C, but I have it opened up just in case it gets hotter during the summer. Right now it's steady on 78C bit it was 80C when I did the snapshot.