Seasonic Focus GX-750 V4 ATX v3.1 PSU Review

Load Regulation

Test 12V 5V 3.3V 5VSB DC/AC (Watts) Efficiency Fan Speed (RPM) PSU Noise (dB[A]) Temps (In/Out) PF/AC Volts
10% 4.410A 1.993A 1.981A 0.996A 75.006 85.564% 0 <6.0 44.24°C 0.931
12.108V 5.018V 3.331V 5.02V 87.66 40.14°C 114.85V
20% 9.851A 2.991A 2.975A 1.199A 149.954 90.064% 0 <6.0 42.5°C 0.955
12.086V 5.016V 3.328V 5.004V 166.498 40.76°C 114.83V
30% 15.635A 3.49A 3.473A 1.403A 224.953 91.134% 0 <6.0 53.51°C 0.968
12.081V 5.015V 3.326V 4.988V 246.839 41.15°C 114.8V
40% 21.425A 3.991A 3.974A 1.609A 300.03 90.934% 947 27.1 41.6°C 0.974
12.080V 5.012V 3.322V 4.973V 329.945 50.55°C 114.77V
50% 26.813A 4.991A 4.971A 1.816A 374.426 90.588% 941 26.9 42.22°C 0.975
12.080V 5.009V 3.319V 4.957V 413.328 51.59°C 114.74V
60% 32.242A 5.992A 5.971A 2A 449.223 90.148% 934 26.7 42.97°C 0.979
12.081V 5.007V 3.316V 4.942V 498.314 53.11°C 114.72V
70% 37.668A 6.994A 6.972A 2.234A 524.258 89.443% 985 28.7 43.26°C 0.982
12.083V 5.005V 3.314V 4.924V 586.134 55.4°C 114.69V
80% 43.159A 7.994A 7.974A 2.341A 599.445 88.741% 1061 30.9 43.87°C 0.984
12.084V 5.003V 3.311V 4.911V 675.502 57.6°C 114.66V
90% 48.981A 8.497A 8.464A 2.449A 674.489 87.951% 1136 32.8 44.12°C 0.987
12.086V 5.001V 3.308V 4.899V 766.897 59.83°C 114.63V
100% 54.600A 9.001A 8.985A 3.085A 749.699 86.994% 1454 40 45.04°C 0.989
12.088V 4.999V 3.305V 4.863V 861.781 61.7°C 114.6V
110% 60.092A 10.005A 10.083A 3.089A 824.718 86.022% 1831 51.3 46.09°C 0.99
12.089V 4.997V 3.302V 4.855V 958.734 62.13°C 114.57V
CL1 0.114A 12.015A 11.939A 0A 101.288 83.747% 958 27.5 40.28°C 0.947
12.112V 5.01V 3.325V 5.052V 120.946 53.46°C 114.83V
CL2 0.114A 19.962A 0A 0A 101.366 82.621% 954 27.4 40.41°C 0.945
12.112V 5.008V 3.334V 5.058V 122.688 49.98°C 114.84V
CL3 0.114A 0A 19.866A 0A 67.379 76.744% 958 27.5 40.66°C 0.93
12.106V 5.02V 3.322V 5.054V 87.797 48.58°C 114.85V
CL4 62.017A 0A 0A 0A 749.526 87.847% 1314 37 45.3°C 0.988
12.086V 5.009V 3.313V 5.013V 853.225 59.04°C 114.61V

Load regulation is within 1% on all major rails. The 12V rail’s load regulation could be tighter if its voltage level weren’t as low at the 20W load, which is my start point at 12.003V. At 40W load, the 12V rail climbs to 12.107V. If I took the 40W load test as a reference, the load regulation at 12V would be 0.23%, which is pretty tight.

Ripple Suppression

Test 12V 5V 3.3V 5VSB Pass/Fail
10% Load 13.0 mV 12.4 mV 12.8 mV 11.2 mV Pass
20% Load 31.3 mV 12.1 mV 13.9 mV 10.3 mV Pass
30% Load 19.1 mV 13.2 mV 14.0 mV 12.8 mV Pass
40% Load 16.1 mV 13.1 mV 14.1 mV 12.0 mV Pass
50% Load 16.7 mV 13.7 mV 14.4 mV 12.6 mV Pass
60% Load 17.9 mV 14.0 mV 13.6 mV 13.4 mV Pass
70% Load 17.6 mV 14.8 mV 14.4 mV 13.2 mV Pass
80% Load 18.4 mV 16.2 mV 15.1 mV 14.0 mV Pass
90% Load 18.9 mV 16.6 mV 15.3 mV 14.6 mV Pass
100% Load 28.2 mV 18.8 mV 18.0 mV 16.2 mV Pass
110% Load 29.4 mV 19.5 mV 18.3 mV 16.6 mV Pass
Crossload 1 22.7 mV 20.0 mV 17.6 mV 12.9 mV Pass
Crossload 2 16.3 mV 18.8 mV 18.5 mV 13.1 mV Pass
Crossload 3 12.8 mV 13.9 mV 17.4 mV 12.9 mV Pass
Crossload 4 27.7 mV 16.1 mV 16.0 mV 15.8 mV Pass

Ripple suppression is good enough.

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15 thoughts on “Seasonic Focus GX-750 V4 ATX v3.1 PSU Review

  1. Hello.
    I see that inrush current is almost 200A at 230V… is that real? Would this much power trip circuit breakers in the house or damage anything?
    Is this PSU safe to use? I have it but now im scared to turn it on…

      1. Thank you for your fast response.
        Does this high inrush current do anything to the lifespan of the PSU or PC?
        I usually power off the PSU at night and power on in the morning to avoid the bright LED lights in my room and now im worried.
        I wish i read your review on this PSU before i bought it. Im very disappointed in Seasonic.

        1. It is hard to drain the APFC bulk caps completely. We follow a special procedure to do so. But yeah, they could use a larger NTC thermistor to lower it because we also have Murphy’s laws.

  2. Hi
    What about SeaSonic Focus GX-750 ATX2 version?
    Does it also have those issues mentioned in the cons section?
    And those listed as cons can be damaging the other parts of the system?
    Thanks

  3. Thank you for the review. You have helped me find good series of Kolink PSUs which have been proving good for the price. Fractal seems to be a very good alternative to Corsair, for similar prices.

    I have been keeping away from Seasonic units due to lack of protection features.

    I had both S12-IIs and M12-IIs (two units each) that only had a simple form of SCP protection. If there is any resistance in the path (as in a broken MOSFET), it will keep draining until one of this happens:

    – Something blows up due to melting/burning shorted component.
    – The PSU shuts down due to undervoltage protections (which from reviews of this platform seem to be set way too low).

    Despite this, Seasonic claims that all protections work despite multiple of evidence from reviews that this platform was broken.
    This was 10y ago and it has cost me hardware that was plugged into the damaged parts (which I didn’t knew had failed). A shame because otherwise they are very reliable, mostly silent PSUs.

    You especially cannot run Seasonic PSUs unattended, as many models have proven to be a fire hazard due to non-functioning ATX protections like described in this review. Stay away!

    1. Forgot to add that I had a 3rd Seasonic made XFX Core PSU that had the same issues. So, that is quite the track record of not doing QC properly.

  4. Any news about the 750w protection features?

    I think you were right and a lot of people who read your review are wondering if the retail 750w model should be considered when making a purchase.

    Thanks a lot for all the amazing work.

  5. Would you consider testing the Super Flower Zillion FG ATX3.1/PCIe 5.0 power supplies? I’ve recently stumbled across them as they are currently on sale and was wondering if they were good.

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