Hi, I have open my iMac late 2012 and I added a "blade" ssd 256GB.
I wanted to replace the original 3.5 hard drive 1TB with a bigger one.
I purchased a WD30EFRX but the fan increases to 1500rpm (instead of the usual 1200rpm).
I tried another hard drive WD20EARX but the fan increases to 1800rpm.
without any 3.5 hard drives running at 1200rpm.
you have replaced the 3.5 hard drive with a bigger one?
thanks
im having sort of similar problem with a bit different configuration
i have a stock imac 27 MD096LL
bought it very cheap with broken lcd
replaced it but decided since its open why not add ssd before sealing it
i also wanted to keep 1tb for a junkyard
so i bought maxupgrade kit
now my fan runs noticeably faster( and louder just like oligominerale)
i decide to investigated further
i ran apple hardware test and as i suspected it gave me hard drive temperature sensor error
it looks like this 4SNS/1/40000000: THOO 9.00
4sns means trouble with sensor T means temperature and H meant hard drive(at least according to google)
and im guessing nine as the value that says that something is wrong
now who here used maxupgrade kit and had same issue?
i need a solution here
ps . i have unplugged the ssd (kept just the hard drive plugged thru maxupgrade cables kit) same issue
unpluged maxupgrade cables(so everything like it was in the beginning) -everything is fine!
also the ssd alone on stock cata cable has no issue
so it must be the kit
somehow it reads wrong temperature or does not reads it at all?
i dont really know
need help_