Recommendations for RAM and GPU HP Z Workstation

Good morning folks.  For those who celebrate, Happy Thanksgiving!  My existing PC is aging.  It works ok for my needs, but it rather slow when I have to render my 3D drawings in Illustrator.  I want to up my game and upgrade Illustrator to something a ittle more current.

I've used a 10 year old versionof Illustrator to draft up stickers for vintage Alfa Romeos.  The version of Illustrator I've been using has suited my needs.

I'm now branching into something new, drawing vintage Coleman Lanterns to put on the side of coffee mugs.  My PC can't really keep up wth the demands of the software,

I'm not a graphic artist.  I only do this for the challenge of figuring out how to use the software and provide a decent representation of the lanterns.  Learning and doing helps to keep my mind sharp, er less dull.

Good morning folks.  For those who celebrate, Happy Thanksgiving!  My existing PC is aging.  It works ok for my needs, but it rather slow when I have to render my 3D drawings in Illustrator.  I want to up my game and upgrade Illustrator to something a ittle more current.

I've used a 10 year old versionof Illustrator to draft up stickers for vintage Alfa Romeos.  The version of Illustrator I've been using has suited my needs.

I'm now branching into something new, drawing vintage Coleman Lanterns to put on the side of coffee mugs.

I'm looking at HP Z workstations (Z4 G4 or Z4 G5) becasue I feel these can do the job.  I'll be looking at used and new.  Things have changed so much since my last purchase and I find it a bit overwhelming.   I realize I can go to the Adobe website and get a list of recommended hardware.  I am looking for recommendations from those who might use these workstatiions for graphc artestry.  My primary interest is in:

RAM - how much?

GPU - Which one

Thank you.