For example, it's usually something like, I'll open my browser and while the app is opening and loading the data, I'll do something else like open another application or finder window, and this can trigger it to go crazy. I usually have to trigger it a few minutes later by quickly interacting with two applications. Now, about half the times I reboot it, or after I wake it up from sleep, it starts crashing. The iMac is doing really weird things now. I did that two weeks ago, but I have realized it was a bad idea. Eventually I upgraded to Big-Sur and used it for nearly a year, but very occasionally it would do minor weird things causing the computer to run slow, or have applications not respond.Įventually I thought, I need to do a clean install of MacOS, maybe that will fix these bugs.

My iMac shipped with Catalina and it worked so smooth and wonderfully. Instead, upgrading to 16GB of memory has to be done at the point of ordering.I have a Retina 4K, 21.5-inch, 2019 running MacOS Monterey 12.4 (21F79). Like the 27-inch iMac, the 21.5-inch has 8GB of memory as standard, but it lacks the user-accessible memory upgrade panel. Again, there's a Core i7 option for online orders, this time running at 3.1GHz (up to 3.9GHz Turbo Boost). 8GB of DDR3 memory is included as standard, and can be either upgraded through Apple's own store to up to 32GB, or – by popping off the small hatch on the rear of the iMac – fitting your own choice of third-party memory.Īs for the 21.5-inch iMac, that kicks off with a 2.7GHz quadcore Core i5 (up to 3.2GHz Turbo Boost) with a 2.9GHz quadcore Core i5 (up to 3.6GHz Turbo Boost) in the higher performance model. Our review unit has been upgraded to the 3.5GHz quadcore Core i7 (up to 3.9GHz Turbo Boost), which is an order-only option. The entry level 27-inch iMac has a 3.2GHz quadcore Core i5 (with up to 3.6GHz Turbo Boost) while the higher-performance preconfiguration has a 3.4GHz quadcore Core i5 (up to 3.8GHz Turbo Boost).

Mouse for imac 27 late 2013