Is Overclocking Worth It on This High-End PC, and How Can I Keep Temperatures Down?

I would avoid increasing the voltage on the RTX 5090. More power means more heat and additional stress on the power connector, so there is little benefit unless you are specifically benchmarking. If MSI Afterburner’s automatic OC scan applied a profile, you can safely click Reset or otherwise return the GPU to its default settings before trying a manual undervolt. Make one change at a time, test stability with games or benchmarks, and monitor temperatures, clock speeds, and power usage.

Your idle temperature is not automatically a problem, especially with a powerful CPU and a liquid cooler whose fans or pump may run quietly at low loads. Check CPU and GPU temperatures separately, verify that the radiator, fans, and pump are working correctly, and make sure the case has good intake and exhaust airflow. For memory, enable the motherboard’s EXPO profile if you want the advertised RAM speed, but test system stability afterward; if you encounter crashes or memory errors, return to default settings while troubleshooting.

An 80°C GPU temperature during a demanding game is perfectly reasonable; the important thing is that it stays below the card’s specified limit and does not constantly thermal-throttle. Overclocking usually gives only a small performance increase while adding noticeably more heat and power consumption. With a high-end GPU, undervolting is often the better approach because it can reduce power draw and temperatures while keeping nearly the same performance.