No problem
It's better if you watch this video:
https://www.youtube.com/watch?v=X77N4sDXP9g Because you can understand better
And I'll add this: forget MSI Afterburner, you will only use Radeon Software to set your card
With Radeon you can decrease the clock voltage, the clocks of core and vram, fans and power limit
If you decrease the power limit you can save power (do it slowly until you see a hashrate decrease)
And with this software More Power Tool you can "trick" windows and GPU to let you decrease even more the voltage clock of your CPU, because it's limited to a minimum of 750mv, and you will probably need 725mv, reducing the power usage
And yes, with this software you don't need to flash bios again, it's awesome
That video is very weird while he can reduce wall power to 137W. I use same settings, but the best i can do 166W at wall.