If you tell us what the objective of your VPO is to be that might help. If just for home use, then I think your PC spec is overkill. The HW backup file is small and a restore works flawlessly! All organ RAR files can be backed up and archived as they rarely (if ever) change. They can usually be downloaded again from the publisher's website as can the main HW executable.
Also what is the ideal organ sample set you have in mind? If it's a big surround set to fully load 24bit uncompressed then maybe 128GB of RAM. I know of an install of an older i5 PC on Win7 running Nancy in 2 perspectives, with 10.1 channels of audio. The owner performed Boellmann's Toccata will full organ towards the end with no issues of latency or audio break up! It has a lot do with Performance & Tuning and excellent an excellent audio interface.
I'd consider going with an Intel chip. See this recent post regarding CPU spikes and AMD.
https://forum.hauptwerk.com/viewtopic.php?f=4&t=20531
Danny B.