Sea Sonic Electronics Co., Ltd was founded in 1975 with its headquarters in Taipei, Taiwan, it is a company specialized in the manufacturing of power supplies for the consumer & industrial markets. In 1981 the company starts the production of power supplies for PC type of systems, being one of the first manufacturers to do so.
SeaSonic manufactures and sells power supplies under its own brand and is also the OEM manufacturer for many other power supplies companies. This makes Seasonic one of the well-known and respected brands in the industry.


Official product link:


Packaging and accessories

The FOCUS GX-750 is delivered in a rectangular cardboard box. The design of the packaging follows the same style as the rest of the Focus product series. The front side of the box has a black triangular shape in the middle, with the outer sides using a sunburst gold effect. At the center the Focus emblem is printed alongside the model of the power supply and its total wattage.


The sides of the packaging present the complete technical specifications of the power supply. On this side, a list is printed which presents the number of connectors and the length of each cable of the power supply.


The back side of the box has an in-depth description of the Seasonic Hybrid Silent fan control, and a brief description of each of the main features.


The power supply and all of the accessories are well protected by the packaging. The power supply is covered by a textile bag with soft foam pads are placed on the top and bottom sides, creating a two-piece protective shell. The cables are sealed inside individual plastic bags, with the same type of textile bag covering them.



The product comes with the following accessories:
– 1x Manual;
– 1x Quick installation guide;
– 1x Velour bag;
– 3x Velcro cable straps;
– 1x 24Pin pin bridge adapter;
– 4x Metallic screws;
– 12x Zip ties.



Model: FOCUS GX-750
Max. DC Output: 750W
Efficiency: 80PLUS® Gold
Modular: Full Modular
Form Factor: Intel ATX 12 V
Operating temperature: 0°C – 50°C
Fan Size: 120 mm
Fan bearing:Fluid Dynamic Bearing
Fan Control: S3FC – Fan-less until 30 % load
Life Expectancy of fan: 50,000 hours at 40 °C, 15 % – 65 % RH
– Over Power Protection
– Over Voltage Protection
– Under Voltage Protection
– Over Current Protection
– Over Temperature Protection
– Short Circuit Protection
Connectors and cables:
– 1x 24 pin ATX connector (610mm)
– 2x CPU (8/4 pins) (650mm)
– 2x PCIe (6/2 pins) (750mm)
– 8x SATA (810mm)
– 3x 4 pin Molex (450mm)
– 1x FDD (+100mm)
Dimensions: 140 mm (L) x 150 mm (W) x 86 mm (H)
Weight: 1.8 kg
MTBF @ 25 °C, excl. fan: 100,000 hours
Compliance: Energy Star, RoHS, WEEE, ErP Lot 6, REACH\
Warranty: 10 years


– 80 PLUS® Gold certified;
– Compact Size – 140 mm deep;
– Tight Voltage Regulation;
– Cable-free Connection Design;
– S3FC – Fanless until 30 % load;
– Multi-GPU setup;
– Gold plated connectors;
– 10 years warranty.

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8 thoughts on “Seasonic Focus GX-750

  1. Hello !! Could you please tell me how many decibels reach at full load (500 watt) and not the average of idle and loa together ?? Thanks in advance !!

  2. This is a late reply, I know, mainly due to the fact I was looking up reviews for a possible second hand deal. The main issue is noise, but unfortunately this review does not understand noise at all.

    First of all, the standard for measuring noise is at 1 meter away from the source. A reading from any other distance cannot be compared with anything else and is completely meaningless. Doesn’t even help comparing the listed models, because who is insane enough to listen to their power supply with their ear 10 cm away from the fan????? They can have vastly differing readings from 10cm, yet be completely silent from a 1m or longer distance, because the sound pressure quickly weakens when spreading as a sphere in all directions. If the PC is on the floor and you sit next to it on a chair, can you hear it AT ALL? If not, (or your super silent case fans are louder), then it doesn’t matter AT ALL. Decibel measurements are misleading, because few people understand the logarithmic nature of sound levels and decibels. Also they need to be highly accurate, which brings us the next problem.

    A margin of error of +/- 5 dB??? Really? What have you measured with? That is a total difference of 10dB, which represents a DOUBLING of the sound level!! Anybody who is not completely deaf will hear much smaller differences than that… In plain English: of two psus with the same measured dB, one could in reality have double the noise level due to measurement error margin? How useful info is that? “This car has 100 horse power, but it could also be 50 due to measurement error”. “What about that car with 70?”. “Oh, it could actually have 140 hp?”

    1. Hi Brian,

      Thank you very much for your comment and information. You are correct in your statement, and I am working towards building a better testing methodology for reviewing power supplies.
      The 1 meter distance has been used to highlight the worst case scenario: having your PC right next to you on the desk and quiet fans which allow the PSU to be audible. Is it the best way to measure noise for a PSU? Absolutely not, but at the time of the development of this methodology it was the best of both worlds. As many complained that if I measure the noise too close to the PSU, it’s not realistic as they are not sitting close to the PSU.

      I appreciate the constructive criticism and I can assure you that I am working towards acquiring better equipment and developing a better testing system for PSU reviews.

      Many thanks once again and I wish you have a good day ahead!

      1. Thanks for taking my comment constructively. Sorry if I was a bit harsh, unfortunately I’ve read too many reviews that ignore realistic issues while splitting hairs on some irrelevant numbers (irrelevant because they are all well within specs). Also too many sites/magazines that only push whatever crap they get advertising money for. I think independent reviewers such as you do an important job by putting out more honest information and educate and help people choose smartly. Which is why I think correctness and relevance are so important.

        The problem with giving numbers that look like they are exact and objective, but are not, is that people get fooled. They want simple answers to complex questions. Thus 2-3 dB less in a chart “is definitively better” even if they notice that the margin of error is 3x higher… They just want to know “which is the best”. Well, it depends on the needs, so then they go for the safe choice, which are the reviews or what everyone else thinks (if it is the wrong choice, at least they can blame someone else).

        When it comes to sound measurements, it is a dilemma. Either it needs to be done scientifically according to standards with highly accurate (=pretty expensive) equipment in an anechoic chamber, or from a purely practical point of view which is more realistic, but far less accurate. The first option allows comparisons with similar tests (done to the same standards), but does not really translate into practice. Option 2 gives more useful info, but can’t be compared to other tests and then everybody’s setup is different. No matter how good scenarios you come up with, you will never satisfy everybody… But this approach would still give a reasonable idea of reality with a reasonable effort, as long as some common sense is used and it is accepted that it can’t be perfect. Maybe ask your readers where and how they keep their equipment and use that to cover most typical scenarios? Add some reviewers impressions to cover what measurements don’t tell. Maybe use measurements to help order the PSUs from silent to loud and/or group the PSUs under descriptive classes (e.g. silent, barely audible, clearly noticeable, disturbing, loud). Just don’t mislead readers with highly inaccurate numbers presented as facts. Yes, some will still want hard numbers, but spare them of selfdeception. A simple dB measurement (even if accurate) does not even tell if the noise is high or low frequency. Our ears are very sensitive to high pitch noices such as motor clicking or coil whine and much less to low pitch sounds, such as air flow. And while there are adjusted spl scales to try to compensate that, they can’t compensate for “irritation” factor. Example: I have stopped noticing our quite noisy AC, but that barely audible clicking sound that recently started on my current PSU drives me nuts! It even cuts throgh my earphones and I can’t concentrate if I need to think. Which is why I ended up on this site, looking for info on a cheap second hand PSUs for that 8 year old spare work PC (its cheaper to by a complete similar PC than a new PSU…)

        Having now found this site, I’m looking forward to interesting reviews.

        P.S. That “ loud” is descriptive of an AcBel that came with an ASUS office computer. It was like a feaf blower even when running idle

        1. As I’ve said previously, I am trying to develop a better way to not only test these power supplies but to measure their noise output. I’m thinking of measuring the noise output in two different locations to get a good average. Mamny issues are still present, such as ambient noise and of course, things that are out of my control such as coil whine.

          “Having now found this site, I’m looking forward to interesting reviews” – Thank you!

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