I have a GFX 100S and had a computer that was 7-8 years old. I work mostly in Lightroom on Windows 11. Here is what I purchased from Puget Systems (attached).
In my opinion, you want:
--the fastest or next to fastest CPU
--a very fast graphics card especially with all the AI stuff, denoising, etc.
--plenty of memory. I went with 128 GB which may be overkill. 64 GB may be sufficient but I wanted to buy once.
--fast storage. I have 2 GB and 8 GB drives SSD NVM. The 2 GB is for the OS and programs, the 8 GB for my photos. I back up my photos to two different 8 TB hard disks and also backup to the cloud using BackBlaze.
This is very similar to the system a friend with GFX 100 II purchased from Puget Systems. The nice thing is that you can spec the computer however you want with the components they offer. They put the computer together and test the heck out of it so you are very unlikely to have problems later on. Also, their support is outstanding.
For more opinions, ask here:
https://www.dpreview.com/forums/1067