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Very loud fan, help ?

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  • Fan
  • CPUs
Last response: in CPUs
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May 20, 2013 2:00:01 PM

So I bought and installed new motherboard today, it all works just fine but some fan is making awful lot of noise, not all the time but randomly when surfing the web it suddenly becomes noisy for a while and then goes back to normal, i suspect its the cpu fan but im not sure, I also recently bought a better PSU aswell, could that be problem ?

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May 20, 2013 3:23:54 PM

roofey said:
So I bought and installed new motherboard today, it all works just fine but some fan is making awful lot of noise, not all the time but randomly when surfing the web it suddenly becomes noisy for a while and then goes back to normal, i suspect its the cpu fan but im not sure, I also recently bought a better PSU aswell, could that be problem ?


Hi Roofey,

Did the PC make this noise before you fitted the PSU. If not, it means its the PSU making the noise.

I suspect its not the PSU, as the PSU fan speed doesn't vary much under short load bursts. You may not notice this, but as you surf the web your CPU is used a lot to render the web pages. Heavy pages will cause the CPU to be used alot to render the page, which increases the load on the CPU making it hotter. Of course when its hotter, the fan kicks in to cool things down. This is most likely the reason why you're experiencing this noise.

This type of feature is common on newly installed motherboards as the settings on each motherboard to control the fan speeds are different. So the user would notice a change in fan noise/speed after installing a new motherboard. A way to fix this would be to set your desired fan settings in the BIOS.

If you're concerned, I would download Coretemp or Speedfan to measure the CPU temperature. If the noise occurs when the CPU is hot or on load, then you've found your problem. Either set the idle fan speeds to higher so you don't notice such a subtle change or perhaps change the settings for the fan speeds per temperature change in the BIOS. If it turns out not to be the CPU, then it would probably be your GPU fan or PSU fan, as modern browsers now take advantage of GPU acceleration and you noted that the PSU was newly installed. You could try disabling the GPU acceleration in this case to eliminate this variable, but its highly unlikely that its the GPU in my opinion.

Hope this helps you with your problem,
Anthony.
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May 21, 2013 2:50:41 AM

The temps are low, according to coretemp the max it goes while in the web is 36 celsius, but I noticed that when it went noisy, the freq 3 load % was the highest, meanwhile others stayed low ? It like quickly pumps up to 87% or so and then goes back to low
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May 23, 2013 2:09:45 AM

I fixed it, apparently had to buy new thermal paste for cpu, all fine now thanks.
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May 23, 2013 10:35:11 AM

roofey said:
I fixed it, apparently had to buy new thermal paste for cpu, all fine now thanks.


Good to hear its working fine now. Its worth noting that thermal paste can dry out over time and cause the CPU to run hotter!
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May 23, 2013 1:32:38 PM

Yea, It's now going fast again at some point and ever since the new motherboard I'm getting lower fps in games too.
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May 23, 2013 3:04:47 PM

roofey said:
Yea, It's now going fast again at some point and ever since the new motherboard I'm getting lower fps in games too.

How much lower is your FPS in general? If its only a few FPS, I wouldn't worry as some motherboards do vary in quality. But if its quite significant then maybe you might need to tweak some BIOS settings.
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May 24, 2013 6:20:28 AM

It is quite significant, I remember I was playing Battlefield 3 before with old mobo and the lowest the fps went was like 45 fps or so when looking from distance to the battlefield where all action went on :p  now it's dropping to 29 and when really choppy aswell, even less requiring games got fps drops or weird choppy lag, I also got new PSU and RAM maybe that's the problem ?
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May 24, 2013 7:20:17 AM

roofey said:
It is quite significant, I remember I was playing Battlefield 3 before with old mobo and the lowest the fps went was like 45 fps or so when looking from distance to the battlefield where all action went on :p  now it's dropping to 29 and when really choppy aswell, even less requiring games got fps drops or weird choppy lag, I also got new PSU and RAM maybe that's the problem ?

Sounds like maybe your hardware isn't getting enough power or its over heating. But your coretemp temperature looks fine. I'll guess its the PSU, as I noted before there shouldn't be such a variance in FPS. Unless theres a new patch on BF3 that updated the graphics, or you went from an extreme high end chipset to a budget one for the motherboard.

What make is your new PSU and how much power does it supply? Also its worth comparing the Amps on the 12V and 5V rail with your other one, as having a higher Watts rating it doesn't mean its more powerful. Decent PSU brands have most of their Amps on the 12V rail which supplies the CPU and GPU compared to cheaper PSU's that supply their power into the 5A rail which is used for mainly other devices, so its not very useful.
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May 24, 2013 7:41:37 AM

It's Corsair CX 500 80+ bronze one, think it had 38A on the 12V rail, not sure about 5V rail, old PSU was some codegen 450W with 28A on 12V rail and 30A on 5V rail.
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May 24, 2013 8:07:34 AM

roofey said:
It's Corsair CX 500 80+ bronze one, think it had 38A on the 12V rail, not sure about 5V rail, old PSU was some codegen 450W with 28A on 12V rail and 30A on 5V rail.

Thats weird cos the CX500 is very good, one of the best in the class. Well another thing to test as you noted would be the RAM? I assume you added new sticks or replaced old stick, so you can either remove it and try older stickers. If not, then its quite a weird issue.

One thing that you could take note is, I once bought a 2nd hand CPU from ebay and it had thermal paste on the contact pads of the CPU as it was an Intel CPU. I noticed the performance was really bad, and I could hardly play a youtube video without choppiness which was weird for a Pentium D. I took the CPU out, noticed there was thermal paste on the contact side and cleaned it and then it was running better. Not sure if its worth looking as its unlikely you'd get thermal paste on your CPU, but mine was from ebay so anything could've happened to it.

Just make sure every component is secure in its slots and sockets.
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May 24, 2013 8:20:03 AM

Yea, I already tried the RAM replacing last night, made no difference, and the components are all secure in slots, tho the 24 PIN atx connector, not sure about that, the one side clicks in nice but other just fits in without any click, not sure how to explain and about the paste on contact side, what do You mean by that ? I could check it, not sure what to check though.
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