Howto

How to see number cores in use - [1]. Htop command appears to show each of 8 cores, and percentage use of each. It appears that running Kdenlive, they are about 30% used each.
There are two threads per core - [2]
Dell Precision specs - Intel® Core™ i7-2760QM CPU @ 2.40GHz × 8
But - laptop specs are in real life less than desktop specs.
Threadripper
Kdenlive uses Melt (MLT) to render.
SweetHome3D uses all cores apparently - [3]
Difference between 2nd and 3rd generation Ryzen -

Sourcing

Ryzen 5 3600 - 6/12 - $200. [4]
Ryzen 7 3700x - 8 core 16 thread - $290. [5]
Ryzen 9 3900x - 12 core 24 thread - $430. 12 core, 3.4 Ghz. [6]
AMD is by far most powerful. More cores and better in multithreading. Lot more faster.
AMD on CPU side - destroys Intel
https://www.pcmag.com/comparisons/amd-ryzen-9-3900x-vs-intel-core-i9-9900k-which-high-end-cpu-to-buy - hihgest level without Threadripper
Old threadripper - [7]
Michael has - [8]