Ryzen 7 5800X3D idles at 65–70°C and ~30–35W package power — Ryzen 5 3600 was much cooler
Hi everyone,
I recently upgraded my CPU from a Ryzen 5 3600 to a Ryzen 7 5800X3D.
Since installing the 5800X3D, I’ve been having a strange issue with idle temperatures and power consumption.
At completely idle in Windows:
CPU usage: around 1–3%
CPU package power: around 30–35W
CPU temperature: around 65–70°C
CPU: Ryzen 7 5800X3D
Motherboard: ASUS TUF Gaming B550-PLUS
OS: Windows 11
With my previous Ryzen 5 3600, idle temperatures were significantly lower under the same general conditions.
I’ve already tried pretty much all the usual troubleshooting:
Reapplied the thermal paste.
Reseated the CPU/cooler.
Checked the cooler mounting.
Checked CPU fan operation.
Tried different PBO settings.
Tried voltage/PBO adjustments.
Checked Windows power settings.
AMD Ryzen Balanced power plan is enabled.
Checked CPU usage and background processes.
Checked C-state behavior in BIOS.
BIOS has been configured/updated for the 5800X3D.
Despite all of this, the CPU still sits around 65–70°C at idle while consuming roughly 30–35W.
The strange part is that the CPU usage is only around 1–3%, so I’m not seeing an obvious process constantly loading the CPU.
At this point I’m wondering if this could be related to BIOS/AGESA, chipset drivers, C-state behavior, or some kind of power-management issue with the 5800X3D.
Has anyone experienced something similar with a 5800X3D on an ASUS B550 motherboard?
What would you check next? I’m especially interested in anything related to C-states, BIOS settings, chipset drivers, or why the package power could remain around 30–35W at idle.
My water cooling system looks like this: water cooling but its from 2019