I just started playing with mine, and i got it at 26.5 mh/s i fear for the hynix it will be close to the max.
Yea, I think it is close to max. My are on 26 for stable mining.
Did you menaged to push them more ? and what is your setup? Oc?
Right now 09/02/2018 with sky high difficulty, claymore 10.0 or 11.0 i got with ASUS rx 470 4gb Mining Edition (one click bios mod , fixed drivers only amd vga drivers no other crap, windows 7 64 bit) 29.5 - 29mh/s stable, 0 errors . - GPU 1150, MEM 2100 (on some 2090,2050,2070 ...) memvdc - 850mv gpu vdc -69, fans 40-48%, gpu takes 44 watt. . You can get 30 mh with gpu 1250 but not worth it i see power consumption increasing too much.