Seasonic FOCUS GX-750 ATX 3.1 review

The Seasonic FOCUS GX-750 ATX 3.1 is a 750 W fully modular power supply in an ATX/EPS form factor, 140 mm deep. It targets builders who want a current GPU power connector, a compact body and a long warranty in one unit. Seasonic lists it in more than one revision, so check which version you are buying. The v4 model includes a 12+4-pin PCIe connector rated at 600 W. The v5 page lists a native 12V-2×6 cable.

The unit carries an 80 PLUS Gold rating. The v5 page also lists a Cybenetics Platinum rating. Two separate Cybenetics evaluations measured standby power at 0.0475 W and 0.0550 W. Standby draw that low suits a PC that stays plugged in all day, such as a homelab box or a desktop that sleeps overnight.

All cables are modular. The v4 model lists two EPS connectors, two PCIe 6+2-pin connectors and one 12+4-pin connector. It also lists eight SATA connectors spread over two cables and three Molex connectors on one cable.

With two PCIe 6+2-pin connectors and one 12+4-pin, it suits a single-graphics-card build better than a multi-GPU workstation. The eight SATA connectors cover a handful of drives. Two EPS connectors are there for boards that want them. The native 12V-2×6 cable on the v5 page means that revision needs no adapter for a card using that connector.

The fan is a 135 mm fluid dynamic bearing design with Digital Hybrid Fan Control. Cybenetics gives the v5 a noise grade of A. Hardware Busters lists the v4 model at A-, with a range of 25–30 dBA.

Owner feedback is more mixed. One owner found it noisier than a be quiet unit in normal mode. The same owner reported a problem after mounting the unit upside-down. Reversing the fan block made hybrid mode work well at idle. Because that report ties fan behaviour to how the unit is mounted, check the orientation in your case before you build.

Tech-legend concludes that the FOCUS GX-750 is a good power supply and an improvement on the Seasonic Focus series. Hardware Busters and Cybenetics have published test data on it, which gives buyers independent measurements to read before buying. The standby figures above come from that testing.

Seasonic covers the unit for 10 years. Every other part in the build draws its power through this one component, so a decade of cover is a real point in its favour.

The GX-750 is a sensible choice for a single-GPU desktop or an always-on machine. Its strengths are the 10-year warranty, the Gold and Cybenetics Platinum efficiency listings, very low standby draw and a fully modular cable set with a modern GPU connector. Its limits are only two PCIe 6+2-pin connectors and one owner's report of fan noise in normal mode. If you plan a build with several 8-pin graphics cards, look at a unit with more PCIe connectors. For most single-card systems, the connector count and warranty fit well.