Very loud Fans.

[tsram90]

I have a zebronics casing.(and a assembled PC)
the problem is that upon starting the fans are very loud like chopper is in air but after sometime it goes back to its silent operation(not so silent).
I checked BIOS and found an option for fans and put it to ultraquite.but did'nt made any diff.

My casing has 3 fans connected to the HDD power cord(side mounted 2 in, 1 out).
One on CPU one small one on raphic card and one on Power supply.

While working also the fans sometimes shoot up but that is usually on bluemoons.
nothing is in the way of fans I checked.

 

[nate42nd]

If the fasn are plugged into the motherboard, the BIOS is probably doing it's job.

Check your CPU usage in the task manager. See if you have a virus that's using your CPU

You MAY want to do a virus scan anyway, but a lot of systems start off with the fans blazing then they slow down after a few minutes.

 

[tsram90]

If the fasn are plugged into the motherboard, the BIOS is probably doing it's job.

Check your CPU usage in the task manager. See if you have a virus that's using your CPU

You MAY want to do a virus scan anyway, but a lot of systems start off with the fans blazing then they slow down after a few minutes.

I mentioned,Fans are connected to the power pin of HDD,CD etc..
CPU usage is ok as it seems.There is now virus I am sure( Has AVG and Norton 360 Plus other Small Anti Virus).

And I had put Options in BIOS to ultraquiet

 

[Orpheous]

My casing has 3 fans connected to the HDD power cord(side mounted 2 in, 1 out).

The 3 fans that are connected to the HDD power cord are probably running on straight out 12V, unless they have a small switch hanging off them to adjust the speed.
If your motherboard has sys fan pin headers on it, you can connect a SMART fan to to each of them.
The sys fan connected fans are controlled by the BIOS settings that you have adjusted, and they throttle the speed of the fan according to the thermal requirements of your PC.
The Noctua range of "sound optimised" fans are very, very good and are as the name suggests, quite quiet. Make sure you get ones with the 3 or 4 pin adaptors, or the speed control switches if your motherboard is lacking sys fan headers.

Another thing that you can do to reduce noise is change your fans to 120mm instead of 80mm, if your case has enough room for them. 120mm fans generally run at a lower rpm and are therefore quieter.

 

[tsram90]

Noctua range[/URL] of "sound optimised" fans are very, very good and are as the name suggests, quite quiet. Make sure you get ones with the 3 or 4 pin adaptors, or the speed control switches if your motherboard is lacking sys fan headers.

Another thing that you can do to reduce noise is change your fans to 120mm instead of 80mm,.

Well it happens like I don't have any mode of accesibility to "Smart Fans" and my mother board does'nt have enough pins for them..

The ones I use doesn't have any speed control.They just take a parallel connection from HDD Plugs.And my case doesn't have space for a 120 mm.

Another thing that worries me is why the sound is high first and then lowers.if it is from HDD power,Then HDD should get a constant power rite.

 

[Orpheous]

The ones I use doesn't have any speed control.They just take a parallel connection from HDD Plugs.And my case doesn't have space for a 120 mm.

If they're connected to a standard 4 pin molex 12V connection, then yes they will be always spinning at a constant speed as there is no voltage modulation

Another thing that worries me is why the sound is high first and then lowers.

Open the case and watch the fans when it starts up next, I'll bet it's the CPU & GPU fans that are spinning up and making noise

 

[valtonray]

while i don't really recommend it under most circumstances you can turn down your fan speeds, but most likely they are doing what they need to do. you may also want to make sure nothing is rubbing against the fan blades as that would be a cause for unusually loud noise.

 

[Orpheous]

.... good point valtonray!
Dust build up, worn bearings/bushes and loose case fan screws will also cause excess noise