The i9 is running into thermal issues on a other laptops https://www.notebookcheck.net/Some-...nning-any-faster-than-a-Core-i7.317268.0.html . This is mostly Intel's fault for keeping the same TDP as the i7, and basing the TDP off the base frequency. For the XPS 15, I was more referring to the massive QC issues that something like the XPS has and nobody cares, but that's probably a different topic. This is too-aggressive thermal throttling that took less than a week to be fixed (are the i9 models even available at retail?) It's a mountain out of a molehill.