Hi im looking to buy a new computer a Custom PC and i wonder if i should go with a 8 core Intel (9900k) processor with turbo up 5ghz and 16 cache or a Ryzen threadripper (1920x) with 12 cores 38 cache and turbo up to 4ghz?

What is best for CAD? Heard alot of software is only using one core at at time! Ive had the most problem coping with patterns and multiple extrudes. And how big part is the graphic Cards effect was thinking of going with a 1660ti

Programs i will use most is
Rhino
Fusion 360
Solidworks
Keyshot
And in the future maybe some marvelous designer and cinema 4D