You can, but honestly, if you can afford 24GB, go for it. Remember that unlike in the Intel days, the GPU uses main memory for its RAM. (Well, I guess integrated Intel GPUs did some of that, too.) That can be painful when you've got a few clips in the timeline and some plug-in wants to have multiple copies of each frame for doing its processing. (Like it applies a blur, then mixes that with the original, or whatever.) I have a 16GB MacMini I sometimes edit video on, and it works, but there are times when things get choppy/slow. I also have a Studio with 64GB, and it's smooth as butter. (I mean it's possible to load it up so it slows down, but it takes a lot more to do so.)