The Seasonic Focus GX line got an upgrade to meet the strict ATX v3.1 and PCIe 5.1 requirements, and in today’s review I will look at the model with 750W max power.
The Seasonic Focus GX-750 V4 ATX v3.1 is (or will be) included in my best ATX v3.x & PCIe 5.x PSU picks article.
Seasonic recently updated its popular Focus GX line, making it compatible with the ATX v3.1 and PCIe 5.1 standards. The line consists of three models with capacities ranging from 750W to 1000W. All have compact dimensions, with 140mm depth. Despite the small dimensions, Seasonic fit a 135mm diameter fan to keep noise output low. Seasonic also talks about the OptiSink design, which brings a new PCB layout to the Focus V4 units, aiming to increase reliability by improving heat dissipation and airflow. According to Seasonic’s claims, the latest PCB design offers an eightfold increase in heat dissipation, keeping the operating temperatures low and increasing the PSU’s reliability.
The prices of the Focus GX V4 units are the following
- Focus GX-750: $ 129.99 (USA) / 119.90€ (Europe) / $119.99 (ROW)
- Focus GX-850: $149.99 (USA) / 139.90€ (Europe) / $139.99 (ROW)
- Focus GX-1000: $189.99 (USA) / 169.90€ (Europe) / $169.99 (ROW)
- Focus GX-750 White: $139.99 (USA) / 129.90€ (Europe) / $129.99 (ROW)
- Focus GX-850 White: $159.99 (USA) / 149.90€ (Europe) / $149.99 (ROW)
- Focus GX-1000 White: $199.99 (USA) / 179.90€ (Europe) / $179.99 (ROW)
ATX v3.1 750W PSU Reviews:
- 1st Player NGDP 750W PSU Review
- ASUS TUF Gaming 750W Bronze PSU Review
- Corsair RM750x ATX v3.1 PSU Review
- Cooler Master GX III 750W ATX v3.0 PSU Review
- DeepCool PN750D ATX v3.1 PSU Review
- Enermax Revolution D.F.12 750W PSU Review
- FSP VITA GM 750W ATX v3.1 PSU Review
- Sharkoon Rebel P20 750W ATX v3.1 PSU Review
- Thermaltake Toughpower PF3 750W PSU Review
- Thermaltake Toughpower GF A3 750W PSU Review
- Thermaltake Toughpower GF3 ARGB 750W PSU Review
- Thermaltake Toughpower SFX 750W Gold PSU Review
- Thermaltake Toughpower GF3 750W ATX v3.0 PSU Review
- XPG Core Reactor II VE 650W PSU Review
- XPG KYBER 750W ATX v3.1 PSU Review
- XPG Core Reactor II VE 750W PSU Review
- Manufacturer (OEM): Seasonic
- Max Power: 750W
- Cybenetics Efficiency: [115V] Cybenetics Gold (87-89%), [230V] Cybenetics Gold (89-91%)
- Noise: Cybenetics A- (25-30 dB[A])
- Compliance (claimed): ATX v3.1, EPS 2.92
- Operating Temperature (Continuous Full Load): 0 – 50 °C
- Alternative Low Power Mode support: Yes
- Power 12V combined: 744W
- Number of 12V rails: 1
- Power 5V + 3.3v: 100W
- Power 5VSB: 15W
- Cooling: 135mm Fluid Dynamic Bearing Fan (HA13525H12F-Z)
- Semi-Passive Operation: ✓ (Selectable)
- Modular Design: Yes (Fully)
- High Power Connectors: 2x EPS (2x cables), 2x PCIe 6+2 pin (2x cables), 1x PCIe 12+4 pin (600W)
- Peripheral Connectors: 8x SATA (2x cables), 3x 4-pin Molex (1x cable)
- ATX Cable Length: 610mm
- EPS Cable Length: 750mm
- 12+4 pin PCIe Cable Length: 700mm
- 6+2 pin PCIe Cable Length: 750mm
- Distance between SATA / 4-pin Molex: 150/120mm
- In-cable capacitors: No
- Dimensions (W x H x D): 150 mm x 85 mm x 140mm
- Weight: 1.59 kg (3.50 lb)
- Warranty: 10-years
- MSRP (excluding VAT): $130
Power Specifications
| Rail | 3.3V | 5V | 12V | 5VSB | -12V | |
| Max. Power | Amps | 20 | 20 | 62 | 3 | 0.3 |
| Watts | 100 | 744 | 15 | 3.6 | ||
| Total Max. Power (W) | 750 | |||||
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…
it is real yes. It is for a very short period, so it doesn’t trip the breaker.
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.
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.
Excellent content. Have you had the chance to try the Seasonic CORE V2 GX-850 (ATX3) – 850W? I’m thinking about buying it, but I’m having doubts. I only found a video on YouTube.
Hi
Thanks for the valuable work, there was an older ATX 3.0 version:
https://seasonic.com/atx3-focus-gx/
From other reviews seems this V3 version is the most reliable one, dodn’t you review that by chance? Best.
I have the V3 in one of my systems, it’s a solid psu. Aris might not have reviewed it but Anandtech did
https://www.anandtech.com/show/21101/the-seasonic-focus-gx-850-atx-3-0-psu-review-cool-quiet-and-robust
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
I don’t have a clue what they fixed and what not, sorry. Seasonic barely sends me any samples to review.
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!
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.
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.
Still, no new fixed sample from Seasonic.
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.
I will review them in the future!
Aris you should review the SuperFlower Leadex III ATX3.0