The long-overdue Mac mini update looks similar on the outside, but how much has it changed on the inside? Quite a bit -- though you'll be glad to hear some things have stayed the same. iFixit has torn down the diminutive desktop, and it's evident that Apple made only very strategic changes to the system's internals. It's still relatively easy to get inside the system by popping off the bottom and sliding out the entire motherboard. And when Apple said the memory was upgradable (unlike the 2014 model), it wasn't kidding. There's a shield to prevent interference, but it's easy to remove and install your own RAM sticks.