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R640 fan PWM range stuck at 100% after CPU upgrade
After upgrading the CPUs in a R640 to Xeon 6242R, the range for "minimum fan PWM" is 100–100, meaning that fans constantly run at full speed, despite thermal profile (and all other settings) being set as default.
A BIOS upgrade did not solve the issue.
In case it's useful, please let me know where to upload lifecycle manager logs.
DELL-Joey C
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May 20th, 2024 07:38
Hi,
Is the iDRAC on the latest firmware?
What is the PSU power that you are using?
If you were to install the old CPU back, does the fan reading is lower?
Do you have any PCIe cards installed?
DELL-Rey G
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May 21st, 2024 15:30
My understanding is that there is a relationship between the model of CPU, number of CPUs in the system, number and type of fans in the system and the number of drives that the system has will determine fans speeds (and what cards are in the system to some extent). The below link has a little information. I do recall when ordering R640 systems in the past that certain CPUs required specific fans, like high performance gold fans.
https://www.dell.com/support/manuals/en-us/oth-r640,poweredge-r640/per640_ts_pub/thermal-restrictions?guid=guid-93fff3dd-23d6-4c73-9995-5f1fa1a359cd&lang=en-us
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