ok, thank you.

i have a 4gb rx480 sapphire nitro+ oc hynix (stock 20-21mh)

at first i have copied 1500 straps to above.
with this i get already 25mh.
after it i set clock to 1250 and mem to 1950 and get 27.5mh

are there some additional tweak which get me nearly to 30mh?