check out this article .. [ur=https://1stminingrig.com/best-bios-rom-sapphire-nitro-rx-580-8gb-oc-hynix-memory-30-mhs/l]BEST BIOS ROM FOR SAPPHIRE NITRO+ RX 580 8GB OC HYNIX MEMORY 30+ MH/S[/url]
remember that it is very important to determine what memory dice you have on your card ...and you also have to remember that sometimes it is not important to get a few extra hashes but it is much better to reduce your power consumption by 10-15% (unless you have free electricity) so look for the best solution for you.
You are suggesting a rather old article (May 24, 2017). To achieve a similar result, only PolarisBiosEditor 1.6.7 and AMD/ATI Pixel Clock Patcher can be used now. Polaris will select the necessary memtimings (one click timing), and ATI patcher will patch the digital signature verification of the modified BIOS.