The Rembrandt-based AMD Ryzen 9 6900HX was benchmarked on Geekbench, where it managed single-core scores of 1,593/1,616 and multi-core scores of 10,151/9,939. While it is faster than its previous-generation counterpart, it cannot hold up against the Alder Lake-based Intel Core i9-12900HK.
https://www.notebookcheck.net/The-AMD-Ryzen-9-6900HX-cannot-keep-up-with-a-similarly-specced-Alder-Lake-P-processor-on-Geekbench.595381.0.html