The 8-core 35 W Core i9-9900T can stand neck-to-neck with a 45 W Core i7-9750H with nothing more than just a large heat sink… for a set amount of time, at least.

When compared to the hexa-core 9th gen Core i7 series, the octa-core 9th gen Core i9 series is able to offer superior multi-thread performance. However, can a passively-cooled Core i9 SKU maintain its performance advantage over a standard Core i7?
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https://www.notebookcheck.net/Uncommon-Core-i9-9900T-requires-no-active-cooling-offers-similar-multi-thread-performance-to-the-Core-i7-9750H.460249.0.html