Apple's UMA design -- a single, fixed pool of RAM integrated into the die with the CPU, GPU and NPU -- makes Mac and MacBook configuration choices a little different than it used to be.

The design remains the same, but you get a new processor and a more generous RAM offering without a price increase. Sadly, ...

I've got a mid-2011 iMac with the stock 4 GB of RAM (two 2 GB Sticks). Running the utility from Crucial.com, looks like the sweet spot for me is 8 GB (two 4 GB sticks). Can I keep my two 2's and just ...