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Phanteks AMP Series 750W Power Supply Review

The Phanteks AMP 750W achieves good performance in almost all sections and it is backed up by a hefty ten-year warranty.

Phanteks AMP 750W
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Our Verdict

The Phanteks AMP 750W uses a popular Seasonic platform, so its good performance is no surprise. The fan speed profile could be a bit more relaxed, though.

For

  • Full power at 47 degrees Celsius
  • High build quality
  • Good performance
  • Fully modular (with 2x EPS connectors)
  • Compact dimensions

Against

  • The fan profile could be more relaxed
  • Mediocre transient response at 3.3V
  • Low 5VSB efficiency
  • Small distance between the 4-pin Molex connectors

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

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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

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Specifications

Manufacturer (OEM)

Seasonic

Max. DC Output

750W

Efficiency

80 PLUS Platinum, ETA-A (88-91%)

Noise

LAMBDA-S++ (30-35 dB[A])

Modular

✓ (Fully)

Intel C6/C7 Power State Support

Operating Temperature (Continuous Full Load)

0 - 50°C

Over Voltage Protection

Under Voltage Protection

Over Power Protection

Over Current (+12V) Protection

Over Temperature Protection

Short Circuit Protection

Surge Protection

Inrush Current Protection

Fan Failure Protection

No Load Operation

Cooling

120mm Fluid Dynamic Bearing Fan (HA1225H12F-Z)

Semi-Passive Operation

✓ (selectable)

Dimensions (W x H x D)

150 x 85 x 140mm

Weight

1.6 kg (3.53 lb)

Form Factor

ATX12V v2.4, EPS 2.92

Warranty

10 Years

Power Specifications

Rail3.3V5V12V5VSB-12V
Max. PowerAmps202062.530.3
Watts100750153.6
Total Max. Power (W)750

Cables & Connectors

Modular CablesCable CountConnector Count (Total)GaugeIn Cable Capacitors
ATX connector 20+4 pin (610mm)1118-22AWGYes
4+4 pin EPS12V (650mm)2218AWGNo
6+2 pin PCIe (680mm+80mm)2418AWGNo
SATA (420mm+150mm+150mm+150mm)2818AWGNo
SATA (300mm+150mm)1218AWGNo
4-pin Molex (450mm+120mm+120mm)1318AWGNo
4-pin Molex to SATA 3.3V Adapter (150mm+150mm)1218AWGNo
AC Power Cord (1370mm) - C13 coupler1118AWG-

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

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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.

General Data-
Manufacturer (OEM)Seasonic
PCB TypeDouble Sided
Primary Side-
Transient Filter4x Y caps, 2x X caps, 2x CM chokes, 1x MOV, 1x Discharge IC
Inrush ProtectionNTC Thermistor & Relay
Bridge Rectifier(s)2x GBU1508 (800V, 15A @ 100°C)
APFC MOSFETS2x Infineon IPA50R190CE (550V, 15.7A @ 100°C, 0.19Ohm)
APFC Boost Diode1x STMicroelectronics STTH8S06(600V, 8A)
Hold-up Cap(s)1x Rubycon (400V, 560uF, 2,000h @ 105°C, MXH)
Main Switchers4x Champion GPT10N50AD (500V, 9.7A, 0.7Ohm)
APFC ControllerChampion CM6500UNX
Resonant ControllersChampion CM6901T6
TopologyPrimary side: Full-Bridge & LLC converter
Secondary side: Synchronous Rectification & DC-DC converters
Secondary Side-
+12V MOSFETS4x Nexperia PSMN2R6-40YS (40V, 100A @ 100°C, 5.3mOhm @ 175°C)
5V & 3.3VDC-DC Converters
Filtering Capacitors

Electrolytics: 6x Nippon Chemi-Con (4-10,000h @ 105°C, KY), 3x Nippon Chemi-Con (1-5,000h @ 105°C, KZE), 2x Nichicon (2-5,000h @ 105°C, HD), 3x Nichicon (4-10,000h @ 105°C, HE)
Polymers: 9x FPCAP, 2x NIC, 6x United Chemi-Con

Supervisor ICWeltrend WT7527V (OCP, OVP, UVP, SCP, PG)
Fan ModelHong Hua HA1225H12F-Z (120mm, 12V, 0.58A, Fluid Dynamic Bearing Fan)
5VSB Circuit-
Rectifier1xPFC P10V45SP SBR (45V, 10A)
Standby PWM ControllerExcelliance MOS EM8569
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Overall Photos

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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

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

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APFC converter

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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

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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

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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

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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

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

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Modular board front

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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

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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

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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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