As I am planning to upgrade my 21.5 inch iMac late 2012, I did some research and conventionally it is only possible to upgrade to 16 gb with 2 X 8 GB rams. Of cause we know the specs of the ram needed (https://eshop.macsales.com/item/OWC/1600DDR3I16P/). However, out of curiosity I googled...
I have an Early 2011 MacBook Pro 13" that runs well but has been a bit slower than I want it to be. A few years ago, I upgraded the RAM from 4GB to 8GB when I started using Adobe software regularly. I still have the stock 320GB Hitachi HDD. Forgive me if I am not clear, I am not very well versed...