they run hotter than their lesser-powered GeForce Founders Edition rivals, as Nvidia has moved on to dual-axial fans for its in-house graphics cards. Hotter temperatures can also limit sustained clock speeds under load, potentially lowering performance.

https://www.pcworld.com/article/3407768/custom-amd-radeon-rx-5700-series-graphics-cards-will-arrive-next-month.html

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Runs hotter than Nvidia equivalent cards

https://www.trustedreviews.com/reviews/amd-radeon-rx-5700-xt

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Here's a thread about it here:

https://www.reddit.com/r/Amd/comments/caoztl/5700_xt_heat/