My only recent experience has been with Ardour (open Source) and Mixbus (Commercial). I tried Reaper and didn’t enjoy it, but I’m used to the Ardour workflow.
I have never found Ardour to be a resource hog and started out running it on a machine with only 2G RAM, although that was a few major versions ago. On my Linux system, Ardour takes less than 300M as a baseline. I also have the latest Harrison/SSL Mixbus 10 Pro which is a bit more heavyweight, but that still takes less than 550M.
I don’t think I’ve ever seen my memory use with Ardour or Mixbus go over about 3G, but I don’t tend to do high track-count projects with lots of plugins.
I have an 18-track recording of a live band in Mixbus which is nearly 3hrs long and the memory use is less than 850M. I don’t have many plugins on this but, frankly, I don’t need them.
Mixbus 10 Pro has a bunch of additional stuff over Ardour, including their “True Analog” mixing engine, and the Harrison 32C and SSL 9000J EQ channel strips, built-in tape saturation emulation, and Dolby Atmos Surround support, which explains the bigger footprint.
(I wouldn’t recommend Mixbus 10 Pro for most home users and would say it’s overkill. I have it because I got it on a special offer price several years ago and have taken advantage of cheap upgrades ever since; Mixbus 10 Pro cost me £59 compared to the full price of £479). Mixbus 10 (non-pro) is £99.99
Ardour is available as a ready-to-run program for a small payment which you can choose yourself. They suggest $30 but if you pay $45 or more you get access to upgrades. Or there’s a subscription program where you can pay as little as $1 per month to get continuous access to upgrades whilst you are subscribed. If you stop the subscription, the current version continues to work.
Details here.
Both Ardour and Mixbus 10 have a free demo version to download and try.
The RAM requirements for Ardour across all platforms are stated as: “2GB is recommended, more is always better”.
The main thing to be careful of with RAM is that, as you add tracks and plugins, that’s where you start to eat into the memory. That applies to all DAWs. You also start to stress the CPU, especially if you use lots of individual plugins like reverbs on each track. There’s techniques to minimise this sort of thing.
My machine here has 32G, but I would have said 8G is probably enough for most home recording purposes.
I would also explore getting something with NVMe SSD drive support, as this will give you very fast data read/write, which is useful for higher track counts. But, in general, it will make your computer feel fast.
Cheers,
Keith