I'm glad that you're planning to upgrade the RAM. I have 64GB and thought nothing would need that much. Alas, it lets me try even bigger collections of DEM files in Transdem and I've maxed out the memory several times already.
I have played with computers since Tandy 1000 , 1970 Era, and the main problem all of us Geeks found over time, you can never have enough CPU, Math Co Processes, Ram, Etc, or Printers with enough memory, if you can believe this, I had Dot Matrix Printer and found from Fry's Electronics, or Radio Shack, Fallen Flags, that I could add memory chip to Dot Matrix, few people knew that in my era.........Adding that Memory chip for 5$, it doubled the Print Speed and Spooling capabilities.
So it is a vicious game of Brinkmanship, over who has the biggest, baddest Computer. If you worked at Cal Tech or JPL, in California, Or
en.wikipedia.org
You might have access to heavy duty Computer Power.
And from what I garner in these time of Simulation Games, need the most powerful GPU you can strap onto to your Rig, I have HP Victus year 2024 with 64GIG DDR4 8 Gig NVidia Ram RTX 4060, I think RTX is Ray Trace, not applicable for trainz, but rest of Qualities do well for my TRS19 and TRS22 Trainz editions.
NVIDIA AD107, 2460 MHz, 3072 Cores, 96 TMUs, 48 ROPs, 8192 MB GDDR6, 2125 MHz, 128 bit
www.techpowerup.com
And finally, super computers are going to Quantum Physics operation, way, way, over my pay grade from days of building personal computers, era of 286-sx on up.
Oh, I should add, Dos 2.0 Command line operation, no windows in 1983 if I remember correctly.