I'm also on a 27" 2012 iMac. Have 32gb inside. I've had the internal drive fail a few times, once under warranty - another time due to age. I'm about to transi

I'm also on a 27" 2012 iMac. Have 32gb inside. I've had the internal drive fail a few times, once under warranty - another time due to age. I'm about to transition to an external SSD as my boot drive since the SSD part of the fusion drive is on its last legs, and keep the internal 6tb HDD for storage. When Apple silicon rolls around, I'm planning to update. Apart from the drives, the machine has been a total rock. No performance issues, apart from when the drives had their issues, but hard to complain this deep into its lifespan.