Does iPhone X support fast charging?
Is there a fast-charging chip inside the iPhone X, and does it support fast charging?
Is it PD protocol?
iPhone X, iOS 16
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You can fast charge your iPhone 8 or later up to 50 percent battery in around 30 minutes. Find testing information for various iPhone models.
Yes, you can fast charge an iPhone X
See this link for further reference
Fast charge your iPhone - Apple Support