

Please note that any iMac that uses a ‘sticky pad’ sensor can simply be re-attached to the new SSD and fan speed is unaffected.

When you power on your iMac, the temperature will incorrectly register as much higher than normal and the fan speed will increase as a result. Solid state drives (SSDs) and the accompanying 2.5” to 3.5” converter bracket do not use this type of socket, meaning that the cable cannot be reattached. Some earlier iMacs systems use a separate plug-in temperature sensor cable, which attaches to a socket on the original hard disk drive (HDD) to determine the drive temperature and adjust the fan speed accordingly.
