try 1750 first, 1750 is safer , 1500 is more tight timings you are copying to higher frequency.. If 1750 brings some good improvement then you dont need 1500.
And last time I forget to mention : install amd 17.12.2 drivers , and from radeon--->gaming--global settings--change gpu workload to: compute ...and be sure it stays like that, even after restart.. This is very important..
https://anorak.tech/t/sapphire-rx-570-pulse/5337
memshift 1500 or 1750?
Thanks.
Memshift 1625 1700 2000. I have pulse ITX (one cooler).
Stop ! If it is not exactly your card, dont flash your card ! I would say more and more but here is Gateless Gate discussion topic.. You have to search and learn about bios modding little bit more..
Look this topic , you have everything to mod your bios : https://bitcointalksearch.org/topic/guidetutorialxmrethhow-to-mod-bios-rx470570480580-vega-mining-1954245
and your card is ITX (mini version) , I think it is normal to expect little bit less hash rate than big brothers..