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My understanding is that the base clock nowadays is quite meaningless.

If the computer has proper cooling. You should always benefit from the turbo speed. On the other hand, if the computer has very poor cooling, the CPU may not even able to stay at the base clock speed (thermal throttling).
Possibly so. Computers are much more complex these days.
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Thank you for the useful advises.

I tried something like 'activity monitor' on my Windows-PC (Microsoft Surface 5, 8 GB RAM, 256 GB SSD). Only up to 88% og RAM was used in the brief testing I did. Most of the time only 60%. The CPU was only briefly strained by about 80%. Most of the time under 10%. So those of you that claimed, that a non pro iMac would be sufficient, surely are right. Yes orph, I have to pay myself. So I will consider the 27‑inch iMac with Retina 5K display, 4.2GHz quad-core 7th-generation Intel Core i7 processor, Turbo Boost up to 4.5GHz, 32GB 2400MHz DDR4, 1TB SSD, Radeon Pro 580 with 8GB video memory, Magic Mouse 2, Magic Keyboard which costs $3,699.00 while the cheapest iMac Pro’s list price is $4,999.00. Besides both models costs about $1000 more in my country due to the conjoint result of Apple and local consumer taxes.

BTW: BootCamp with Windows 10 is supported on iMac Pro [https://support.apple.com/da-dk/HT208330 ]
I think the 27" 5K iMac has user upgradable memory so you could save even more money by buying the minimum from Apple and then buying 3rd party. Or you could save money by buying what you think you need and then upgrading in the future should that assumption be too little.
 
Yes, you are right. I cited Apple's RAM list prices. But I’m aware that the 27" 5K iMac is RAM-upgradable, and that one can get the same RAM much cheaper.
 
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