After checking out the Core i5 and Core i7 SKUs, we're now finally ready to benchmark the Core i9 version of the XPS 15 9570. In short, users are better off investing in more storage, RAM, or faster graphics than to plop down an additional $250+ for the Core i9-8950HK.
https://www.notebookcheck.net/Dell-XPS-15-9570-i9-8950HK-4K-UHD-GTX-1050-Ti-Max-Q-Laptop-Review.355641.0.html
Why didn't you use ThrottleStop to undervolt it?? Intel XTU is a buggy app and uses CPU cycles in the background, whereas ThrottleStop does the undervolting work much better and has no issues.
Pity there are no undervolted results because they should be much better than the stock, and people who buy this system would undervolt it...