Hello Felix,
The guys over at Puget systems do an insane amount of hardware tests with content creation software. They publish all results on their blogs and website. It is a good resource to compare hardware options when building a machine.
https://www.pugetsystems.com/recommended/Recommended-Systems-for-Adobe-Premiere-Pro-CC-143/Hardware-Recommendations
Given the info in the above article there are a few roads you may consider:
– The 9980XE, while technically being the fastest, may not be the most ‘valuable’ option. Like you can see: the 16-core and 14-core come insanely close to the same level of performance in Premiere Pro. So consider getting the 16 or 14-core version of the Core-X instead and spend the money you save on more RAM or GPU.
If you are also considering the ‘mainstream’ line of CPU’s, the 9900K is THE way to go. The i9 is the best scoring CPU for After Effects and Photoshop (because of high clock speed) and is great for editing GOP-based codecs (H.264/HEVC). An intel CPU with integrated graphics allows premiere pro to playback and export GOP-codecs faster than Xeon or Core-X.
– If you choose to save money on the 18-core CPU, buy a better GPU. While the RTX 2060 is good value overall, it gets beat by an RTX 2080 Ti by a fair margin. It’s kind of a weird combo to do a RTX 2060 with a really expensive 18-core CPU. Get the 2080 Ti, it is the ‘best value’ compared to other really expensive GPU’s like quadro or titan. Other apps like Resolve will also love you for the better GPU.
– You didn’t mention RAM: I would do 64 GB or more if you can for a machine of this budget. (I assume you are going fairly expensive since you are planning to buy an 9980XE). 32 GB is the minimum for comfortable 4K.
– You are absolutely right about the NVMe SSD: get them as much as you can. Get one of about 256-512 GB for booting and apps, and get one of 1 TB+ for storing the Premiere Pro Cache and Database and/or storing media.