Hello
I would like be able to make my PC quieter. Could you please tell me, what is the main culprit for noise? I know there are two fans inside the case. Is the noise caused by the power supply fan, the case fan or something else?
Noisy computers are fairly common, which makes them no less annoying. Most of the time the noise is harmless, but it is worth investigating to make sure there are no outstanding problems. You’re on the right track with the fans - most of the time, computer noise is caused by the fans inside the case.
Possible Cooling Problems
It’s possible that your computer is overheating and that the fans are running constantly. Gaming, videos and graphics can put stress on the computer and cause it to run hot. First, take a look around the computer - is it sitting on a soft surface like a carpet or bedding? There needs to be some airflow on and around the unit. It should be sitting on a hard surface or elevated just a little off the floor. Check the vents on the side and make sure they aren’t blocked by anything and that air can flow in and out of the unit.
Temperature Check
If you’re sure there is adequate airflow, you can monitor the PC’s internal temperature in BIOS or download a program that will let you easily see the information. There is a lot of controversy about what is a “safe” temperature, but you can find some temperature recommendations by CPU type and then looking at this chart on Technibble.
Keep it Cool
In addition to good airflow, there are other things you can do to cool down the computer. You will need to take the case off, so if you’re not comfortable rooting around in your computer, you might want to get some tech help. Take the case off and get a can of compressed air. Blow the dust off the fans, the heatsinks and the power supply. Make sure the vents are clear of dust and debris. You can also set up a desk fan outside the unit to pull hot air out, but then you have to deal with that fan noise as well.
Heatsinks
You may want to see if you have enough heatsinks. There are two kinds of heatsinks. An active heatsink is a device that attaches to the processor for attracting and dissipating heat from the unit that it is attached to and into the air to be distributed with a fan. A passive heatsink works the same way, but does not have a fan attached to it. All heatsink devices need to have some sort of thermal compound on it. This compound creates a seal between the heatsink and the part of the unit that it is cooling. Most new heatsinks have a rubber thermal compound pad that is already attached while others will require that you use a thin layer of thermal paste. If you remove the heatsink from the unit, you need to put more thermal compound on it, even those that came with a pad. Make sure you apply only a thin layer - too much will stop the heatsink from working properly.
A noisy fan means that the computer is working as it should - make sure that the fans are clean and working properly and that you have all of the cooling measures in place that your computer can hold. Once your computer is cooled properly, the fans will probably not run as often and the noise should subside.



