for tweaking gpu's individually, you can use Auros Tweaking Engine, available here: https://www.gigabyte.com/Support/Utility/Graphics-Card. It doesn't matter if you have a gigabyte gpu or not. You can also use Asus Tweaking Tool. With these tools you can overclock your gpu as well as make adjustment to fan speed to correspond with the gpu temperature to cool it down. just don't know if they work with radeon's. but i think they do.
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for tweaking gpu's individually, you can use Auros Tweaking Engine, available here: https://www.gigabyte.com/Support/Utility/Graphics-Card. It doesn't matter if you have a gigabyte gpu or not. You can also use Asus Tweaking Tool. With these tools you can overclock your gpu as well as make adjustment to fan speed to correspond with the gpu temperature to cool it down. just don't know if they work with radeon's. but i think they do.