Both the Sapphire Pulse and Nitro+ are great mining cards. The difference is the Nitro+ has a better heatsink, runs cooler and a dual bios switch. I've had very good results with the Polaris Bios Editor 'one click timing patch' timings.
PBE automatically adjusts the timings with the bundled performance straps according to the cards memory type.
https://bitcointalk.org/index.php?topic=2806981.msg40226027#msg40226027The only change I made to the PBE bundled timings is on the RX 580 Nitro+ cards with Samsung memory, I changed the bundled UberMix v3.1 Samsung timing with this one that is much more stable.
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I easily get 31 MH/s on Samsung cards with a 1150 MHz core clock and 2150 MHz memory overclock. On Hynix cards I get 32 MH/s with a 1150 MHz core 2250 MHz memory overclock.