https://miningchamp.com/gpus/192/Gigabyte-Radeon-RX-570-hashrate
https://miningchamp.com/gpus/193/Gigabyte-Radeon-RX-570-hashrate
https://miningchamp.com/gpus/150/Sapphire-Radeon-RX-570-8GB-hashrate
https://miningchamp.com/gpus/190/MSI-Radeon-RX-580-hashrate
https://miningchamp.com/gpus/266/Sapphire-Radeon-RX-580-hashrate
https://miningchamp.com/gpus/130/Sapphire-Radeon-RX-580-8GB-hashrate
https://miningchamp.com/gpus/91/Sapphire-RX-580-Nitro+-8GB-hashrate
https://miningchamp.com/gpus/53/Asus-GeForce-1070-hashrate
Comparison is wrong at least about the Rx 570 which I own quite a few of them, both run without problem at 30.6 mhs the 4gb version of the Sapphire and at 31.6 mhs the 8 Gb version also of Sapphire , the 4 Gb should be bios modified while the 8 Gb version sometimes can only be overclocked through MSI if they happen to be Samsung memory which the 8 Gb version are most of the time.