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Upgrade the memory of your 2020 iMac up to 128GB
Memory Upgrades for 2019 Mac Pro - Save Up to 65% vs Factory Costs
Mac Pro Westmere Ordering Tips: What to Get and What to Skip
Save yourself a bundle, and get a better machine.
You can also get an MPG Pro Workstation for a pre-configured and pre-tested Beast.
Get the minimum from Apple when ordering (because it’s ultra expensive), then upgrade. See the Memory page. I use about 100GB of OWC memory in my various Macs.
Get the cheapest drive when ordering, remove it, then stuff in four (4) 2TB Hitachi 7K2000 or 2TB Western Digital Caviar Black drives.
Use a solid state drive for a boot drive in the lower optical bay (not just any SSD, this one).
Solid state drive
See this page.
You do not need a hardware RAID card (unless you really need it—and you know who you are if you do.
The use of software RAID using Disk Utility or SoftRAID 4 is the right solution for most every photographer.
See this Hits and Misses page for details on video cards.
Most users will find the base video card incredibly fast. Very few users benefit from the “faster” card.