The Phanteks AMP Series is based on the newest revision of the Seasonic Focus platform, which is quite popular in the PSU market. The strongest model of the AMP line, with 750W max power, offers high performance, but its noise output is quite high, reaching 33 dB(A). On the other hand, the similar capacity Corsair RM and RMx units, along with the Asus ROG Strix 750, offer high performance along with silent operation,

We have already reviewed the AMP models with 550W and 650W max power and found them to be highly competitive in the tough PSU market. For users that need more Watts, though, the AMP model with 750W is a more suitable choice. Like the other two members of the family, this one also uses the newest version of the Seasonic Focus platform, which is among the most popular in today’s market.
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https://www.tomshardware.com/reviews/phanteks-amp-series-750w-power-supply