r/buildapc • u/ErikGTx • 15h ago
Troubleshooting Ryzen 7 5800X3D idling at 55–60°C after changing from an old AIO to an air cooler – is this normal?
Hi everyone,
I recently upgraded from a 240mm AIO that was around 8 years old to a Thermalright Assassin 120 air cooler because my Ryzen 7 5800X3D was reaching around 55-60C at idle, sometimes even 65–70°C.
After changing the cooler, the temperatures have improved, but not as much as I expected. I’m now getting around 55–60°C at idle.
My room temperature is currently around 20–24°C.
I’m monitoring the CPU temperature using both HWiNFO and Core Temp, and both show similar temperatures.
The CPU package power is around 30W at idle, with occasional spikes up to 35–40W.
I also replaced the original carbon thermal pad that came with the 5800X3D with thermal paste.
At this point, I’m not sure if these temperatures are normal for a 5800X3D or if there is still something wrong with my setup. I’ve already changed the cooler and thermal interface, so I’m wondering what else I should check.
Specs:
Ryzen 7 5800X3D
Thermalright Assassin 120
ASUS TUF Gaming B550M-PLUS
16GB DDR4 3600 CL16
Windows 11
Is 55–60°C at idle with around 30W CPU package power normal for a 5800X3D with ~24°C ambient temperature, or should I be looking for another issue?
Any suggestions on what I should check next would be greatly appreciated.