Taken from X-Plane developer's blog... I asked about 8 gb of RAM and that was Ben's reply:

 

"I don’t know – I would expect it will work with 8 GB but it depends on what else you run (e.g. 3rd party airplane, other add-ons, XSquawkBox, texture res setting)."

 

This is just with standard mesh, so, more RAM on it's way for my system.

I thought my 32GB was overkill when I built my rig a couple of months ago.  I'm already thinking of 64GB but would have to change out all 4 modules.

I thought my 32GB was overkill when I built my rig a couple of months ago.  I'm already thinking of 64GB but would have to change out all 4 modules.

You're lucky you can even think about it.  My Dell motherboard maxes out at 3 channels x's 4 GB's...so only 12GB's system wide for me....  This would be the one limitation to have me swap out to a current high-end MB to have the option for 64 GB's that is available to you!

 

Yeah, I'm green with envy, lol!

I tried upgrading from 16GB (2x8GB) to 32GB (4x8GB) last year, but with 4 modules filling out all the slots the memory overheated very easily (my Gskill RAM has large heatsinks so they were touching each other). My system became unstable so I had to send them back. I'm fairly confident 16GB should be fine for my needs, I don't use UHD mesh nor much in the way of AI.

I have 16 in my system and flying around LA with upper mid range settings and no UHD I maxed out at 9gb usage, I think you'll be fine.