The 1750 MHz timing strap mod is only for cards with Samsung memory. I have a Nitro+ RX 570 4GB card with Hynix memory. I copied the 1500 MHz strap to the higher timings and get ~29 MH/s UBQ and 760 MH/s DCR dual mining. I use an overclock of 1150 MHz core clock 2075 MHz memory clock with a -96 mv undervolt and -10% power limit in Afterburner.