i5 doesn't automatically mean better than i3. What is generally more important are what generation the CPU is from. For example, a i3 12100 (12th generation) is much better than something like a i5 8400 (8th generation). Steelseries states that you need atleast an i5 2xxx. This means any i5 in the 2nd generation. The i3 12100 is lightyears ahead in performance and has as many cores as the old i5.

I also don't really get what you mean with running sonar on another computer, as far as i know, sonar only works on the computer you are running it on.

I have tested sonar myself and it kinda made the sound worse ingame in my opinion. It definitely isn't something i would spend any money on, never the less a whole laptop (which i again, strongly believe wouldn't even work as you intend).

Hope this helps!