Hello,
I have a HP Z420 Workstation (v2 with the Ivy Bridge boot block) with a Xeon 1650 v2 CPU, 48 GB RAM, GTX 1070 Ti, BIOS 03.96 running Windows 10 Pro build 19041.450 in UEFI mode and have noticed that when the processor is under any sort of load, the CPU fans are not ramping up to compensate whatsoever which causes uncomfortably/dangerously hot temperatures at the CPU's cores or overall package (89*C+, where the CPU has a Tcase rating of 70*C and Tjmax cut off at 95*C). I've ensured that the heatsink and fans are all free of dust and debris, and recently installed the missing front fan into the bottom of the chassis as well to improve airflow throughout the chassis.
This behavior can be observed by running HP Performance Advisor and refreshing the sensors while running a stress test such as Prime95, AIDA64 Stability Test, etc. You would expect to see the fan speeds increase, however they just remain where they are -- the fan speeds can be increased only across the entire system by cranking up the Idle Fan Speed under Thermal in the BIOS, however after the half way mark this becomes unbearably loud. I've ensured that the ambient temperature sensor in the front of the case is functional and it registers correctly.
Does anyone have any suggestions as to what may be causing this? I have seen some previous reports that this was related to Intel's MEI and AMT which I re-enabled to no avail, and wanted to check with the community before I pull the machine out to do a CMOS reset, flash back through BIOS revisions, etc.
Thanks! 🙂