I started this thread because I watched a video where the presenter showed how he wasn't using all his memory in Activity Monitor and therefore had enough. The made me think I needed to have free memory. That's what I get for watching YouTube videos.
Empty, unused RAM...? At these prices? 🤣
Here's my current RAM usage:
MacOS is using 27 of 32 Gb, and the remaining RAM is filled with "cached files". This will improve performance by holding various things in memory, but that space can be recovered if needed.
Some of the "used" memory itself is compressed. Special hardware on the CPU "zips" and "unzips" the data before it is processed. I've got about 12 Gb of RAM that is actually holding up to twice that much of data.
The graph on the left shows the amount of memory compression in use. I'm still "in the green", which is absolutely fine.
Here's a Mac with 16Gb, where the Memory Pressure is getting a bit high.
The graph has moved from green to yellow, as the amount of compression used has increased. There's 2 Gb of cached files, but c. 14 of 16 Gb is being used, of which over 8 Gb is compressed (e.g. probably around twice that size).
As said, for audio work, if you're using high-quality orchestral samples from people like Orchestral Tools, Spitfire, Vienna Symphonic Library, then yes, you'll need a lot of RAM. 64 Gb should be sufficient, unless you're using hundreds of tracks.
If you're just doing pop tracks, jazz bands or small ensembles using Apple's own Logic samples, then I'd say 48 Gb is probably plenty. In fact, the 16 Gb memory summary above is running about 20 tracks of Orchestral Tools samples in Dorico with absolutely no problem.
MacOS's memory management is very good; also the memory bandwidth, and the speed of both the RAM and the SSD is insane, to such an extent that you can have huge amounts of memory compression and there's hardly any noticeable effect.
In fact, I've seen 8 Gb systems juggling 3 times their body weight in actual data, with only some slowness as data was swapped back in.
As for "future proofing" -- I haven't seen any increase in my RAM use in the last 6 years on Apple Silicon. Certainly not anything that would require an ADDITIONAL 64 Gb on top of an existing 64 Gb! 🤣