I agree that the motherboard is most likely the issue. I never had any issues with my old motherboard when using the RTX 4090. I think I’m going to send the motherboard and CPU back for a replacement. The CPU temps are stupidly high which makes me think that there’s an issue with it as others with the same cooler as me with less fans have better temps than me. When gaming my CPU hits 85C and straight to 89C in Cinebench. Most people with this CPU average 60 to 70C when gaming and 80C in Cinebench. I definitely lost the silicon lottery as the CPU struggles to do -15 or above with curve optimizer (games start stuttering) but Windows works fine up to -40. Everyone else seems to be able to do all core -30 with ease.