I saw this answer late, and had an additional comment:
The “automotive demo scene” (winter) for UE4 did not load on my 64 GB system; it ran out of memory. (I was using about 24 GB for virtual machines doing other things, though – maybe it could have loaded if I removed that…)
The point is: 8 GB is ludicrously too little for anyone who actually wants to make use of the UE5 features. You can’t even use the UE4 features with that little RAM.
For anyone targeting 4k cinematic renders, I’d think 64 GB is an absolute minimum requirement, and I’d think 256 GB could be totally defensible.
Also note that, when your GPU has more RAM, the OS wants to use more regular RAM to match that, for optimal work. It can work with less, but it runs better with more, AFAIK. Thus, sticking a 24 GB VRAM GPU in a 32 GB RAM host system might end up being fairly unbalanced.