Phanteks AMP Series 750W Power Supply Review

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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Product Photos

The Phanteks AMP 750W has compact dimensions, and it is fully modular, featuring two EPS and four PCIe connectors. It can deliver almost full power at +12V, while the combined power of the minor rails is restricted at 100W since no modern system will require more Watts from these rails. 

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Product Photos

Specifications

Power Specifications

Cables & Connectors

There are two EPS and four PCIe connectors, along with a large number of peripheral ones. All cables are long enough for a 750W power supply, but the distance between the 4-pin Molex connectors is low at 120mm. It should be 150mm, at least. Finally, there are in-cable caps only on the ATX cable, and all connectors use the standard 18AWG gauges, with only the sense-wires being thinner (22AWG).

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Cable Photos

Component Analysis

We strongly encourage you to have a look at our PSUs 101 article, which provides valuable information about PSUs and their operation, allowing you to better understand the components we're about to discuss.

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Overall Photos

As we already mentioned, all AMP models are based on Seasonic's newest Focus Plus platform. The main PCB is compact. Still, there is enough clearance between parts to allow for proper airflow. The build quality is excellent, and all parts are by good manufacturers so that they will have a pretty long life even under harsh operating conditions.

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The transient filter has all the necessary components, but as usual, our EMC pre-compliance testing will reveal if it does a good job. 

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Bridge rectifiers

There are two bridge rectifiers, bolted on a dedicated heat sink. 

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APFC converter

Right in front of the APFC converter is the NTC thermistor and bypass relay combo, that restrict inrush currents. 

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Main FETs and primary transformer

The main FETs are arranged into a full-bridge topology, which is supported by an LLC resonant converter.

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12V FETs and VRMs

The +12V FETs are installed on the solder side of the main PCB. Two DC-DC converters are powered from this rail, to generate the 5V and 3.3V rails. 

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Filtering caps

Japanese manufacturers provide the filtering caps, and most of them belong to good lines with an increased lifetime. Besides electrolytic caps, a large number of polymer is also present on the main PCB and the modular board.

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5VSB Circuit

The standby PWM controller, responsible for the 5VSB rail, is partially hidden by the primary heat sink. 

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Modular board front

At the front side of the modular board, we find four polymer and three electrolytic caps. As you can see in the photos above, there is room for more polymer caps. 

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Soldering quality

The soldering quality is good, and the same goes for the parts that Seasonic used to make this platform. 

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Cooling fan

As usual, for a Seasonic-made product, the cooling fan is provided by Hong-Hua, and its model number is HA1225H12F-Z. It uses a fluid dynamic bearing and measures 120mm. The use of a larger fan was not possible, due to the compact chassis. 

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