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Asus ROG Strix 750W Power Supply Review

The strongest assets of the Asus ROG Strix 750W are the high performance and the silent operation, along with the good build quality.

Asus ROG Strix 750W
(Image: © Asus)

Protection Features

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

Protection Features

 

OCP

12V: 82.6A (133.23%), 12.059V
5V: 27A (135%), 4.97V
3.3V: 26.8A (134%), 3.305V
5VSB: 6.1A (203.33%), 4.968V

OPP

870.02W (116%)

OTP

✓ (145°C @ 12V heat sink)

SCP

12V: ✓
5V: ✓
3.3V: ✓
5VSB: ✓
-12V: ✓

PWR_OK

Proper Operation

NLO

SIP

Surge: MOV
Inrush: NTC Thermistor & Bypass Relay

The OCP is set a little higher than the optimal level, which is 130%, but this is probably the case to retain compatibility with graphics cards that can cause high power spikes. The OCP at 5VSB is also pretty high, while the OPP is reasonably set. Finally, there is over-temperature protection, which works correctly, given the PSU's semi-passive mode.

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.

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(Image credit: Tom's Hardware)

DC Power Sequencing Scope Shots

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(Image credit: Tom's Hardware)
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(Image credit: Tom's Hardware)

There are no issues here, with the 3.3V rail being lower than the other two in all cases. 

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

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(Image credit: Tom's Hardware)

Load Regulation Charts

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(Image credit: Tom's Hardware)
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(Image credit: Tom's Hardware)

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.

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(Image credit: Tom's Hardware)

Ripple Suppression Charts

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(Image credit: Tom's Hardware)
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(Image credit: Tom's Hardware)
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(Image credit: Tom's Hardware)

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).

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(Image credit: Tom's Hardware)

IR Images

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(Image credit: Tom's Hardware)
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(Image credit: Tom's Hardware)
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(Image credit: Tom's Hardware)
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(Image credit: Tom's Hardware)

The large heat sinks easily handle the thermal loads, and this is why the fan speed profile is so relaxed.

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  • octavecode
    I was about to say "looks a lot like a Seasonic unit" then i checked the manufacturer. :P
    Best PSU reviewer , greetings from Greece.
    Stay strong and healthy everybody.
    Reply
  • Aris_Mp
    octavecode said:
    I was about to say "looks a lot like a Seasonic unit" then i checked the manufacturer. :p
    Best PSU reviewer , greetings from Greece.
    Stay strong and healthy everybody.

    Thank you for your kind words!
    Reply