HTPC 750ti - Fan problems

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mubster

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I have a ASUS PH 750ti in my HTPC, since last week when I boot the machine after a minute or so the fan will rev up to full boar for a second and calm down, this would only happen on boot and would not be a problem after.

I took the card out and put it in my desktop too see if it was a motherboard or OS issue and found that the fan does not spin on boot and only spins after revving up to full boar, should I be concerned?
 
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amtseung

amtseung

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If you've cleaned out the heatsink and the rest of your system isn't also blanketed it dust, I wouldn't worry about it too much.

If it worries you, you could use Asus GPUTweak or MSI Afterburner or something similar to set your own custom fan curve, so you know that it's running as intended. When a fan revs full bore during boot, that's pretty normal behavior, since feeding full power to components and waiting for feedback is a common way for the post process to verify that all the things plugged in are working properly.
 
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mubster

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According to afterburner the fan speed is steady at 23% but the tachometer is all over the place. It does steady out after a minute and GPU temps aren't an issue, so as you said it's probably fine.
 
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amtseung

amtseung

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The tach might just be reading wonky voltages. I'd rely on the fan speed percentage for a more reliable reading.

I remember one time Afterburner told me my GPU fans were at 55%, but the tach was reading like 450k rpm. Knowing that the fan it was trying to read has a maximum RPM of 2600, I duly ignored it. To make matters worse, reopening afterburner made it read properly, and rereopening afterburner made it read at like 200k rpm. Sometimes, afterburner just gets downright weird. Have you tried seeing what HWMonitor or GPUTweak or EVGA Precision X have to say about your fan speeds?
 
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mubster

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Using GPUZ, HWMonitor, AIDA64 and Percision X provides a simular result where GPU speed in% form is steady at 22-23 and the fans speed in rpm is unstable, reaching 0RPM then revving up later.

I don't think the sensors are reading incorrectly as when any software shows 0RPM the fan is not spinning, and when it spikes it is quite loud for a second or two.
 
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GameFreak01048

GameFreak01048

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From what your describing, it sounds like it could be three things, it could be when you boot up, as mentioned by amtseung, your PC is testing that everything is working correctly on boot, then once the fans have been tested and the PC thinks everything is fine, the fan curve takes over and the fan will slow down because it is not needed to cool components because they are cold on boot.

If the fans are revving up when you play something demanding its because a certain temperature has been reached by your GPU so your GPU is just trying to cool itself normally.

However if you turned your PC on and no fans spin on your GPU, that's not too much of an issue but if you were doing literally nothing and letting the PC just idle and the fans rev up, it would be a temperature issue.

Hope this helps :)
 
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mubster

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Temps are in normal ranges and all software reports the speed as a percentage at a steady 22 - 23 %, it's the actual RPM of the fan that's unstable, its been 3 weeks now and every 3-5 mins the fan will stop for 25 seconds then rev up to 3500rpm for 1 second then sit at 1000 - 1200 rpm for another 3-5 minutes where it again halts, over this time GPU temprature will not change sitting at a cool 33C, I believe the issue is a faulty component, Was just hoping someone may know which component is my problem.
 
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GameFreak01048

GameFreak01048

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Apologies for the slow response, this is looking more like a software issue to me, maybe edit the factory fan curve so that the fans stay on even when they don't need to, if it can maintain a steady 800RPM on idle for a long time (about an hour) without anything weird going on then I would say that the fan curve would be to blame. Worst case scenario RMA the card.
 
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mubster

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It looks like it's RMA time then, fan can't keep steady even with a custom fan curve, for more than 10 minutes,
 
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GameFreak01048

GameFreak01048

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Yep that would be the solution then, sorry :(

At least your next card should work fine :)
 
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