The key to the Iris Xe Max is Intel’s 11th-gen Tiger Lake CPU, plus some power-sharing and an Intel technology known as Deep Link.

Intel claimed Saturday that its new Iris Xe Max graphics can outperform Nvidia’s GeForce MX350 in gaming, and even top a GeForce RTX 2080 in some encoding tasks. How it does that—through power sharing, and an Intel technology called Deep Link—could make the package of an 11th-gen Core Tiger Lake CPU and an Iris Xe Max GPU a spec to look for in future laptops.
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https://www.pcworld.com/article/3587732/intels-iris-xe-max-gpu-brings-graphics-chops-to-thin-and-light-laptops.html