I am building 3 rigs soon and it's only a matter of time before I want to tweak them to get the best hash rate that I can. I have never built a GPU rig before and all this custom bios stuff is a bit daunting to me.

What is the purpose of a custom bios? What can you do with a custom bios that you can't do in an overclocking tool?

How will this affect my cards when it comes time to re sell them?

How do I find out which type of memory my cards have?

MSI Radeon Armor RX 470 4GB

and

SAPPHIRE NITRO Radeon RX 480 4GB

I intend to use SimpleMining OS to run all of my rigs


Thanks everyone