It has a fan which will produces tiny little bit noice, when in fast charging mode and in a quiet room. I can barely hear it since it's 2 feet away from where I sleep, but it annoys some ppl who wrote some negative reviews about this charger on Amazon. BTW I doubt the iPhone X could benefit from the fast charging so probably it won't trigger the noise by the fan.
Overall I like it so much that I totally would recommend it.
There are different types of Samsung wireless charger so pay attention to the name of them may or may not contain keyword "FAST".