How many fans in iMac 5k?

[Mikegs]

How many fans are in the iMac 5k?
Does the graphic card have a fan?

Lowest speed of the main fan is 1200 RPM. Can it be lowered further by third party software?

Thanks

 

[redheeler]

One fan. No it can't be lowered any further than the idle speed due to overheating protection built into the OS.

 

[andy9l]

One fan in iMacs since 2012 @1,200rpm minimum. No, the mGPU does not have a fan.

In the 5K iMac:
GPU under load = 2,300rpm max.
CPU + GPU under load = 2,700rpm max.

Whilst 2,700rpm is extremely loud, 1,200rpm is near silent. I would say there's no need to lower further.

The 5K iMac fan noise is about twice as loud as the 2013 iMac when under load.

 

[Mikegs]

Thank for the information. I have sensitive ears (OCD maybe...), so I think 1000 RPM would be more optimal during light use

 

[Significant1]

Thank for the information. I have sensitive ears (OCD maybe...), so I think 1000 RPM would be more optimal during light use

Are you sure, you don't mistake mechanical hard-drive noise as fan noise?
(don't have a 5K iMac)

 

[Mikegs]

Absolutely. I have an SSD only

 

[Nismo73]

Thank for the information. I have sensitive ears (OCD maybe...), so I think 1000 RPM would be more optimal during light use

I hear it in a silent room. Maybe in the future they would be able to have it run at idle at 1000rpm to lower the idle db number.

 

[cynics]

Are you sure, you don't mistake mechanical hard-drive noise as fan noise?
(don't have a 5K iMac)

I can easily hear the fan @ idle over Apples current WD 7200 rpm HDD offering. Reason I know is aside from knowing the sound of a HDD is because of replacing HDD's with SSD's.

That said I still consider the fan @ 1200 RPM virtually silent.