CPU Fan not spinning... but wait...

UKFX

UKFX

UKFX

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Core i5-2500k is at 34/35°c.

Looking down at the Alpenfohn Matterhorn Pure, it sort of twitches every now and then. Like it's going to spin, but then the system says "I'm not hot enough baby".

Just to make sure I went into the Bios of the Gigabye Z77-D3H and changed the CPU Fan Control method from PWM to Auto. The other option is Voltage but I left that.

Lol, I find it amazing. My Zalman Z9 Plus seems to be doing an adequate job of keeping the processor cool. Ambient temp at the moment is 23.2°c.

Should I be concerned?
 
the twitch suggests that the mobo is giving your fans a tiny bit of voltage, but not enough to spin the blades. fans need different amounts of voltage to start up, and evidently your fans start a bit later than some others. but at those temps there's probably nothing to worry about. try putting your fans manually up to something and see if they spin
 
What motherboard do you have? Gigabyte use ET6, Asus use some other program to set low and high CPU temps to low and high fan speed. Maybe you need to set it up just a little so fans spin slowly instead of acting like they are having a seizure.
 
I said what Mobo I have.

Still though, when the temps rise the fan spins up. At the moment I have a fair few things open, a voice conversation on Skype going. I'm stalling things on Steam and installing Oblivion GOTY via disc. CPU is around 37.

How do I get it spinning. It's plugged into the fan header just fine. I was using Ubuntu before I got Windows 7 today I never had any issues with it spinning then.

CPU temp seems to be okay even when it's not spinning. At least it isn't cooking itself.

Help?!
 
Your BIOS should have some sort of figure that it uses to determine PWM duty cycle scale per degree of temperature. Also most PWM controllers will kick the fan over at 100% on PC startup, this prevents the condition you are experiencing where the inertia and friction of the fan are larger than the force to get it started.

If you find the fan speeds up once you do something more than just idle stuff then it's namass massive worry.

Still I'd prefer a fan to be moving on a cooler that's designed to be actively cooled rather than just sitting there twitching.
 
Just had the PC off while I had dinner. Came back, booted it after switching back to PWM mode and it is now spinning.

In the GA-Z77-D3H I cannot see any of the options of which you folks speak. I can see stuff like, CPU Controller method, an stuff, an there is something PWM slope or something like that, but that is blocked out.

I just want the fan spinning all the time. Even if it the temps are super cool... naturally. I don't want to bump into this problem again nor do I want to have to worry about it occurring again.

? What do I do?
 
So far it seems okay. It hasn't happened since.

I'd just like to point out though, that I've had to reinstall Windows 7 again. Probably because I messed with the Open Case thing, an reset that.

It buggered up, an said... Windows cannot start. An regardless of what I tried it wouldn't have it. So I had to do all this **** AGAIN.

Very annoying.

I already have ET6. Might play about with it.

Bad idea to OC to 3.9 through that? I'd probably feel more comfortable doing that in BIOS anyway.

As long as my fan doesn't fail to stop spinning a second time, for whatever reason. I'm happy. There must have been some underlying reason for it?

I guess I'll have to keep an eye on it. :( So far, not pleased though.
 
What I am annoyed about is I have to rely on a stupid program to make my CPU cooler work. 65%. At 50% it barely spins. So I set it at 65% at 30°c and the readout from OpenHardwareMonitor says 550 ish RPM. LOL. :mad:

The issue is, the Alpenfohn Matterhorn CPU Cooler has a low RPM design. 1500rpm is the max. An because it's heatsink is so big, yet well designed, along with a copper plate and 6 u-shaped copper pipes, as you noticed, it doesn't even need to spin to stay around the 30-34°c. I used MX-4. Took me a few attempts at applying it and the base got a minor scratch when I took it off the second time, but when I put the paste on a third time, I think I nailed it with the perfect amount.

Why Gigabyte? WHY?!

Put ET6 INSIDE THE ****ING BIOS U FOOLS!

Christ almight.

Time to write a complaint.

Oh, also, ET6 works at setting the fans, however, the text doesn't fit half of the windows on 125% DPI settings on Windows 7, an sometimes the interface crashes.

:(
 
Tealc said:
Your BIOS should have some sort of figure that it uses to determine PWM duty cycle scale per degree of temperature. Also most PWM controllers will kick the fan over at 100% on PC startup, this prevents the condition you are experiencing where the inertia and friction of the fan are larger than the force to get it started.

If you find the fan speeds up once you do something more than just idle stuff then it's namass massive worry.

Still I'd prefer a fan to be moving on a cooler that's designed to be actively cooled rather than just sitting there twitching.
Click to expand...

Well, according to EasyTune6, at default, 35%, I can confirm that the RPM shown in OpenHardwareMonitor drops and goes to 0. I can see the fan stop altogether. 50%, it barely spins, but hovers roughly at 200-280rpm. 65% is more reasonable, though still slow, at around 500-600rpm. Obviously this will increase if I'm doing something more demanding. Likewise, if I had not touched anything, when I do little work, or idle, the CPU cooler used to shut off, right, but if I played a game, it'd kick in. However I'd prefer to permanently resolve this issue, so that it is constantly spinning, above 200rpm. 500rpm the minimum I should think.

The max RPM is 1500, as mentioned before.

There is the PWM Slope in the bios, for manual control, which increases the fan speed per °c, which is pretty cool, but I'm unsure of how it works entirely. It has increments, from 0.75 PWM, to 1.25, then 1.50, then 1.75, then 2.0. I think that's the max, unless it goes to 2.5, I cannot remember, this is the increase per degree. But I'm unsure if it going to be effective.

I would really rather not rely on Software to run Bios features. I think that defeats the purpose.

Thanks for any help on offer.
 
The reason ET6 runs with OS is so you can adjust setting without needing to turn of system, boot to bios, make adjustment, open OS, see what fan turns cpu idle & load, turn off system, boot to bios, make adjustment, open OS, see what fan turns cpu idle & load, turn off system, boot to bios, make adjustment, open OS, see what fan turns cpu idle & load, turn off system, boot to bios, make adjustment, open OS, see what fan turns cpu idle & load, until fine tuning is done.
 
2 degrees PWM might be better. Maybe the default curve is set up for an Intel 5000rpm cooler, where 20% would already be over 1000rpm. At 2 deg PWM by the time you get to 35 degrees you'd be at 70% duty cycle, assuming the zero reference point is 0 degrees.

If you have something like 0.75 degrees PWM even at 30 degrees you'd only be asking for 20 or so percent duty cycle.

It almost sounds like you are running this off 5v power or the PWM signal directly.
 
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