I'm going to be buying a new iMac soon and man, upgrading ram on the apple site is the craziest ripoff I've ever seen. +$1,000 for 64gb? Wow. So I'll be adding ram myself it looks like. I haven't bought a computer since my macbook in 2012, and I had apple max the ram out on it. So installing it myself is new to me. Looks like Apple uses 2666MHz DDR4 memory, so I guess that's what I'll be looking for? I want 64GB, so does that mean I should get two 32GB sticks? Or four 16GBs? The iMac comes with 8GB so does that mean I only need to get 56gb of ram? A 32, a 16, and an 8? Seems like it'd be easier just go start fresh with the two 32s or four 16s. How many slots are there in the iMac? Is it easy to install? What are the most reputable brands and where should I buy it? Thanks!