[X4U] iMac CPU fan is 3000+ rpm

[Andrew Lynch]

It is my understanding that on older iMacs, you need to make sure that the replacement drive has the same temperature sensor interface as the original drive.  Otherwise the mac spins up the fans because it cannot tell what the temperature is. 

Drew

Sent from my iPad

> On Jan 11, 2014, at 9:07 PM, catsoul <catsoul at thinkplan.org> wrote:
> 
> what I don’t get are:
> 
> 1. why a hard drive would “make” a computer’s fans rev up unless the computer were generating more heat?
> 
> 2. why use software to throttle down the fan speed before learning what the cause of the fan rpm uptick is?
> 
> what if the computer really needs those fans to spin faster?
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