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The new Phanteks AMP line consists of high-performance power supplies, which use a proven platform, the same used by the new Seasonic Focus GX models. The Phanteks PH-P650G is equipped with a pair of EPS connectors, so it is compatible with energy-hungry CPUs like AMD's Threadripper models. Moreover, if you don't utilize both of its EPS connectors, you can use it along with a pair of high-end graphics cards for a powerful gaming system.
Another advantage of the Phanteks PH-P650G is the silent operation, even under harsh conditions with increased operating temperatures and heavy loads. In our tests, we had to push the PSU with a full load at almost 46 degrees Celsius to make its fan spin at 2080 RPM and exceed 40 dB(A). With lower loads, even at high ambient temperatures, the PSU is quiet, and the semi-passive operation lasts for quite long.
Since we follow a rigorous methodology, and we are also very picky, we always manage to dig out some cons in every product that we evaluate. In the Phanteks PH-P650G's case, the most notable cons are the inefficient 5VSB rail, the mediocre transient response of the 3.3V rail, and the small distance between the peripheral connectors. Moreover, the overall performance might be high, but not better than that of the popular Corsair RM650x, which features even quieter operation. Nonetheless, if you find the Phanteks unit at a lower price than its Corsair rival, it is a great choice.
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Disclaimer: Aris Mpitziopoulos is Tom's Hardware's PSU reviewer. He is also the Chief Testing Engineer of Cybenetics and developed the Cybenetics certification methodologies apart from his role on Tom's Hardware. Neither Tom's Hardware nor its parent company, Future PLC, are financially involved with Cybenetics. Aris does not perform the actual certifications for Cybenetics.
Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.