CPU fans going at full speed, using PWM Fans

[Chris Powell]

I have been having this problem for months now and have tried everything that I could to fix the problem with no avail. A couple of months back my CPU fan started to go at full speed all of the time. I tried reapplying thermal paste with no avail. I bought a new CPU cooler for the CPU, this cooler came with 3 pin headers with a manual control for the fans. When the control didn't work and the fans were going full speed I replaced both 3 pin CPU fans that are in a push/pull configuration to 4 pin PWM fans. The problem still persists.

I have also downloaded speed fan for my computer to see what the temperatures and rpm readings are for the case, they are as follows.

System Temp 72F
CPU -76F
AUX 81F
Core0 75F
Core1 86F

CPU Fan 755 RPM
CPU Fan 1612 RPM
Aux Fan 766 RPM
Aux1 Fan 439 RPM
Aux2 Fan 1650 RPM

The specs for this computer are as follows
Case- Cooler Master HAF 932 Advanced
Motherboard- Asus Z68 V Pro
CPU Intel Core I7 2600K
RAM 24 GB
OS Windows 8.1

Now what gets me is that the CPU temp is at -76F where the cores are at high temperatures. I am at a loss right now, I have tried everything that I can think of at the moment. Any help would be greatly appreciated.

 

[Karsten75]

It's quite possible that the processor failed in a small, localized way and the temperature sensor is defective. THat may send the wrong signals to the rest of the system trying to cool it.

Try another monitoring system, such as Open Hardware Monitor or Realtemp or the Intel Processor Diagnostic tool and see what those tools report on the various temperatures.

This if course does not explain why a manual fan could not be controlled to monitor the temperatures. However, I suspect you were lucky, since the 70+ degree temp is high and your processor would have been damaged if it was not cooled. (if we can believe the temperature, that is).