I am thinking about building an AMD rig. I already have a couple nvOC rigs. However I am still a newb and keep reading about this bios flashing stuff. Do I really need to flash my GPU bios in order to get decent hash rates with sapphire rx580 8g's? Or can I just use the OC settings within rxOC?

If someone can explain my necessity to mod the bios or tell me I don't need to that would be amazing.

I am thinking that if I need to mod the bios I might just build another nvOC rig.