9800X3D idling around 50–55°C after trying basically everything — CPU problem or something else?
Hey everyone, I’m trying to figure out if my 9800X3D could be the problem because I’ve pretty much eliminated everything else.
My first PC build was basically the exact same setup I have now, except it had Lian Li SL Wireless fans instead of TL Wireless fans. With that original build, I was getting around 34°C idle in Windows.
I ended up selling that PC and later built a Lian Li Mini V2 system with a new 9800X3D. Ever since then, I’ve been getting around 50–55°C idle, sometimes higher.
I originally had a Lian Li HydroShift C AIO and an X870 motherboard. I suspected one of those was causing the higher temps, so I changed both.
I switched back to the same build/setup I had originally, using the new 9800X3D, and I’m STILL getting around 50–55°C idle.
So at this point:
CPU: Ryzen 7 9800X3D
Same general build that previously gave me ~34°C idle
Tried a different motherboard
Tried a different AIO
Remounted the block
Reapplied thermal paste
Tried different thermal paste
Checked pump RPM / ran pump at full speed
Tried different AIO/fan header configurations
BIOS idle is around 47–48°C
Windows idle is usually 50–55°C
PC is completely stable otherwise
The biggest thing making me suspicious of the CPU is that the motherboard and AIO have both been changed, but the high idle temperature stayed the same.
The original version of this build was around 34°C Windows idle, so I know this setup can run much cooler.
Could the 9800X3D itself be the issue, or is there something else I’m overlooking?
At this point I’m thinking about taking the whole PC to Micro Center and having them test the CPU on a known-good system.
Any ideas on what else I should check?