Upgraded a couple of computers - case fan louder

[imported_Salamander]

I just recently upgraded my graphics card from an X1950 Pro to an HD4850. In addition, I repalced an Asus DVD Rom drive with an LG Blue Ray burner. Everything else in my case (Antec P180) is exactly the same. This includes 4 Papst 4412 FGLL fans: two intake and two exhaust. I control the fan speeds with a Sunbeam 4 Channel Rheobus.

Since my upgrade, I've noticed the upper intake fan is noticably louder - though I haven't adjusted the controller at all. Does anyone know what could be causing this?

 

[WoodButcher]

I'll bet it's the vid fan you hear simply through the top fan. It's always possible you bumped that fan while doing the upgrade.

 

[imported_Salamander]

It's not the vid fan. I can hear it get louder when I increase it's speed using CCC. The top fan is esay to tell when I adjust it using the fan controller.

 

[mindless1]

It is probably louder because a different load on your PSU is causing a variation in it's 12V output. In other words, your fan controller is not a type of device were you dial a specific voltage, what you do instead is dial a duty cycle (or resistance, I am not familiar with which method that controller uses) that semi-indirectly results in an average voltage change, that would vary it's output depending on the input voltage.

 

[imported_Salamander]

Originally posted by: mindless1
It is probably louder because a different load on your PSU is causing a variation in it's 12V output. In other words, your fan controller is not a type of device were you dial a specific voltage, what you do instead is dial a duty cycle (or resistance, I am not familiar with which method that controller uses) that semi-indirectly results in an average voltage change, that would vary it's output depending on the input voltage.

This is the most likely explanation I have heard so far. I assume replacing the DVD Rom with the Blu Ray burner isn't doing much when it's not being used, so the graphics card is the primary reason for a larger load on my PSU. So, wht if anything so I do about this?

 

[PieIsAwesome]

Originally posted by: Salamander

Originally posted by: mindless1
It is probably louder because a different load on your PSU is causing a variation in it's 12V output. In other words, your fan controller is not a type of device were you dial a specific voltage, what you do instead is dial a duty cycle (or resistance, I am not familiar with which method that controller uses) that semi-indirectly results in an average voltage change, that would vary it's output depending on the input voltage.

This is the most likely explanation I have heard so far. I assume replacing the DVD Rom with the Blu Ray burner isn't doing much when it's not being used, so the graphics card is the primary reason for a larger load on my PSU. So, wht if anything so I do about this?

PSU upgrade?

If you had a multimeter you could check the 12v at the fan to be sure.