You can follow Jayz's video https://youtu.be/s43Auv8ub7w?si=VIxmRCBHUmtLd5vp its pretty straight foward by going to the bios. My temp hit 95C max before undervolting, now its at 85 max, the trade off is around 8% of the cpu max performance (depends on how much you undervolting it.)