My Ryzen 7 9800X3D boosts to around 5.42 GHz while I'm playing Helldivers 2. CPU usage is only about 20–25%, but temperatures stay around 85°C. The processor is cooled by a Corsair iCUE LINK TITAN 360 RX RGB AIO, and my case has 10 fans besides the GPU fans. In BIOS, I'm using PBO Advanced with motherboard limits, a 10x scalar, +200 MHz boost override, and an all-core negative 15 curve optimizer. From what I've read, this seems like a fairly common and safe configuration. Should I be concerned about the temperature, or is this normal behavior for the 9800X3D?
3 Answers
A low overall CPU-usage percentage doesn’t always mean the processor is barely working. A game can heavily load a few cores while the total usage remains around 20–25%, and the 9800X3D can still boost those cores to high clocks. Your PBO and +200 MHz settings may also increase heat. If temperatures or stability concern you, try temporarily disabling the boost override or using less aggressive PBO settings and compare performance and temperatures.
The temperature itself isn’t immediately dangerous, but 85°C with a large AIO is worth investigating rather than dismissing as normal. Check whether the pump is actually running at the expected speed and whether the fans ramp up properly when the CPU heats up. Monitoring the CPU’s actual package power and individual core temperatures may also reveal whether one core is boosting unusually hard.
85°C is technically within the safe operating range, and Ryzen processors are designed to boost aggressively until they approach their temperature limit. However, that is still warmer than I’d expect from a 360 mm AIO during a gaming workload, especially at only 20–25% CPU usage. I’d check the cooler installation, pump speed, radiator airflow, mounting pressure, and thermal paste. Also make sure no protective film was left on the cold plate.
The protective film is definitely removed. I’m playing at 1440p with a 5080 and maximum graphics settings, so most of the workload is on the GPU.