Hey Tad the ps3 was made 9 years ago a cmos battery lasts 8-10.
I cant “upgrade” the pcie ssd, there is none, only a sata ssd. Ive taken apart a half dozen imacs and they are not that difficult to work on. You have to take EVERYTHING out . everything consists of a lcd panel, hard drive, a fan a power supply and speakers a bunch of screws and a few ribbon cables. Apple can change its proprietary connection every year if they like but most understand its just their version of m.2 in this case pcie m.2
My Late 2015 27 came with a 2.5 ssd only. I want to replace that with a 4TB 2.5 hdd and add a 512 M.2. Do I need the thermal sensor for the 2.5 hdd?