Phanteks AMP Series 650W Power Supply Review

The Phanteks AMP Series model with 650W capacity offers high enough performance and features quiet operation.

Phanteks AMP Series 650W
(Image: © Tom's Hardware)

Why you can trust Tom's Hardware Our expert reviewers spend hours testing and comparing products and services so you can choose the best for you. Find out more about how we test.

Protection Features

Check out our PSUs 101 article to learn more about PSU protection features.

Swipe to scroll horizontally

Protection Features



12V: 75.2A (139.26%), 12.094V
5V: 27.7A (138.5%), 4.922V
3.3V: 27A (135%), 3.251V
5VSB: 6.1A (203.33%), 4.985V


915.7W (140.88%)


✓ (115°C @ 12V Heat Sink)


12V: ✓
5V: ✓
3.3V: ✓
5VSB: ✓
-12V: ✓


Accurate but less than 16ms



Surge: MOV
Inrush: NTC Thermistor & Bypass Relay

The OCP triggering points are high on all rails, and the same goes for OPP, which is close to 141%. Typically, both OCP and OPP triggering points should be set within 130%. Finally, the power-ok signal is accurate, but it is a bit lower than 16ms because of a long delay between the hold-u[ time and the power-ok's hold-up time. 

DC Power Sequencing

According to Intel’s most recent Power Supply Design Guide (revision 1.4), the +12V and 5V outputs must be equal to or greater than the 3.3V rail at all times. Unfortunately, Intel doesn't mention why it is so important to always keep the 3.3V rail's voltage lower than the levels of the other two outputs.

The 3.3V rail is always lower than the other two. 

Cross Load Tests

To generate the following charts, we set our loaders to auto mode through custom-made software before trying more than 25,000 possible load combinations with the +12V, 5V, and 3.3V rails. The deviations in each of the charts below are calculated by taking the nominal values of the rails (12V, 5V, and 3.3V) as point zero. The ambient temperature during testing was between 30 to 32 degrees Celsius (86 to 89.6 degrees Fahrenheit).

Load Regulation Charts

Efficiency Chart

(Image credit: Tom's Hardware)

Ripple Charts

The lower the power supply's ripple, the more stable the system will be and less stress will also be applied to its components.

Infrared Images

We apply a half-load for 10 minutes with the PSU's top cover and cooling fan removed before taking photos with a modified FLIR E4 camera able to deliver an IR resolution of 320x240 (76,800 pixels).

The temperatures are not high. The highest that we recorded are in the main transformer and in a pair of caps near the PWM controller that handles the 5VSB circuit. 

MORE: Best Power Supplies

MORE: How We Test Power Supplies

MORE: All Power Supply Content

Contributing Editor

Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.