CPU fan not ramping up RPM's with temps

ryanmcbc

Honorable
Jan 1, 2014
2
0
10,510
Well I've scratched my head long enough with this one so I thought I would pick others brains. I recently decided to upgrade my thermal paste to Artic Silver 5 as it has been approx. 5 years since the chip was mounted and I was seeing what I push my OC to. Ever since I reinstalled the cooler I have noticed in HWMonitor that my CPU fan no longer ramps from 2500 RPM's to 3500 RPM's as it used to as the temps rise. So instead of sitting at 60 - 65 degrees under load it runs right through 70 to 75 degrees. I have reapplied my thermal paste several times (likely for no good reason) as I know we all mess it up on occasion, and it has zero effect on the fans performance. I am aware that its a golden oldie chip, board etc. but it was working right up until I decided to tinker cause a replacement is on the way in a few weeks. I would rather not melt it before than, plus after 2 days of banging my head on my case I just want to know why.

Rig is:

Pentium D930 3.0ghz (OC at 3.9 @ 1.400V) stock cooler
Asus P5WD2-E Mobo
Thermaltake 700 watt PSU (new)
2x Powercolor HD 7770's in crossfire
Rear 120 mm exhaust fan + 2 80 mm intakes on front and bottom
MB temps are ok and GPU's never break 60 degrees at a OC of 1150 core and 1400 memory.

Any ideas of what could suddenly be stopping my CPU fan from increasing RMP's from 2500 to 3500 like before with CPU temps would be greatly appreciated. I have tried moving the plug to the PWR and Chassis and it just sits at 2500 regardless.
Thanks in advance.
 
Solution
To be CLEAR, you had fan speed control of the CPU fan before, but now it's not working...

1) CPU Fan is inserted in the CPU_FAN on the motherboard (should be the SAME as before)

2) Motherboard BIOS has Fan Control enabled (should be SAME as before)

3) You have FAN CONTROL SOFTWARE working (again, SAME as before)

*The fan control solution is called "AI QUIET" so make sure you download the proper software from the motherboard support site so you can adjust it.

You should be able to DISABLE, and ENABLE the fan in your software so you can observe it working.

**If the CPU_FAN is 3-pin then it likely only supports VOLTAGE-Controlled fans. If it's 4-pin it may support ONLY PWM-controlled fans (some support both and Voltage).


I don't...
To be CLEAR, you had fan speed control of the CPU fan before, but now it's not working...

1) CPU Fan is inserted in the CPU_FAN on the motherboard (should be the SAME as before)

2) Motherboard BIOS has Fan Control enabled (should be SAME as before)

3) You have FAN CONTROL SOFTWARE working (again, SAME as before)

*The fan control solution is called "AI QUIET" so make sure you download the proper software from the motherboard support site so you can adjust it.

You should be able to DISABLE, and ENABLE the fan in your software so you can observe it working.

**If the CPU_FAN is 3-pin then it likely only supports VOLTAGE-Controlled fans. If it's 4-pin it may support ONLY PWM-controlled fans (some support both and Voltage).


I don't know the EXACT name of the software as the site is just timing out:
https://www.asus.com/Motherboards/P5WD2E_Premium/#overview

Summary:
- Fan control software in Windows
- Fan control enabled in BIOS (if applicable)
- CPU fan to CPU_FAN on motherboard
- PWM or Voltage as applicable
- *If it worked before it should again, so see what you changed.
 
Solution
http://dlcdnet.asus.com/pub/ASUS/mb/socket775/P5WD2-E%20Premium/e2385_p5wd2-e_pr.pdf

If this is your motherboard (if not the Premium yours likely works the same) then look at pg. 4-37. *NOTE THAT:

0) CPU FAN must be plugged into the proper motherboard CPU_FAN slot.

1) You must enable "Q-FAN CONTROL" in the BIOS for fan control to work

2) You must choose PWM or DC (DC is "voltage" for 3-pin, variable speed fans) as applicable.

3) You can choose different profiles (quiet, etc)

4) You probably have to SAVE and reboot to take effect.
 

ryanmcbc

Honorable
Jan 1, 2014
2
0
10,510
Thanks a ton for the answers, unfortunately they are right in line with diagnostic path I was following with no success.
Theoretically it should have been status quo as I changed no settings in Windows (7 Ultimate btw) or the bios. But once it was proving to be a problem I had pretty much the same thoughts. It is a 4pin, has always been plugged into the CPU_FAN on the mobo and is still on PWM. (have tried it on DC just to prove it didn't fix it). I have actually never had Q-Fan control on but I have also turned it on and tried the silent normal and performance settings with no change rebooting with each. I am monitoring with HWMonitor and have had no other fan control software installed. I just installed Speed fan (4.something) and it said my fan was running at 100% which I know to be incorrect but does seem to explain why the pc wouldn't ramp it up if it thinks its already at max. I have since tried some slower profiles in bios mixed with stock clocks and volts to see if it would throttle below 2500rpm and realized it will not increase or decrease the fan speed at all. Starting to think it may be an issue with the actual cooler fan itself, or a mobo issue with controlling the speed. Still at a loss and wondering if the headache is starting to be worth the while as have new board chip and ram coming in 10 days now.