Unboxing the Seasonic FOCUS GX-750W ATX 3.0 Power Supply / Compact 14cm Design, 12VHPWR, Gold Standard A Certification

FOCUS GX-750W ATX 3.0.

The acclaimed mainstream model, the “FOCUS GX-750W ATX 3.0” power supply from Haiyun, has undergone a full upgrade. Now incorporating ATX 3.0 specifications, native PCIe 16pin / 12VHPWR connectors, and keeping a compact 14cm size for easier installation. It comes in a range of power specifications, including 750W for the mainstream, 850W for high-end, and a maximum of 1000W. With an 80 Plus gold medal for high conversion efficiency, an FDB 135mm cooling fan, and a 10-year warranty, it ensures a safe power supply that has passed Cybernetics gold medal efficiency and A-level noise certification.


  • ATX12 V3.0 specification
  • Rated power: 750W
  • Form Factor: Intel ATX 12V
  • 80 PLUS level: Gold
  • Input voltage: 100-240V
  • Input current: 15-5.5A
  • Input voltage frequency: 50-60Hz
  • Power Correction PFC: Active PFC
  • Fan: FDB 135mm, Hybrid Silent Fan Control
  • Dimensions: 150 x 140 x 86mm
  • Protection mechanism: OPP / OVP / UVP / SCP / OCP / OTP

All connectors come in a sleek black circular weave pattern:

  • One 20+4 Pin connector, 610mm long
  • Two CPU 4+4 Pin connectors, 700mm long
  • One PCIe 16 Pin (12VHPWR) connector, 750mm long
  • Two PCIe 6+2 Pin connectors, 750mm long
  • Eight SATA connectors, 950mm long
  • Two SATA 3.3 connectors, 550mm long
  • Three large 4-pin connectors, 690mm long

Seasonic FOCUS GX-750W ATX 3.0 full-mode power supply out of the box / small body Double Gold Certified ATX 3.0, PCIe 5.0

The popular Haiyun Seasonic FOCUS GX series is now upgraded to the latest ATX 3.0 specification, inclusive of a native PCIe 16 pin 12VHPWR power supply. The model is clearly labeled “FOCUS GX-750W ATX 3.0”, making selection more straightforward for users. Despite the updates, the power supply retains its compact 14cm size for excellent case compatibility and features an upgraded FDB 135mm cooling fan.

The FOCUS GX-750W ATX 3.0 utilizes active PFC, full-bridge LLC resonance, and a DC-DC synchronous rectification design for a single-channel 12V output. This aligns with the high current and wattage demands of modern CPUs and GPUs. Its FDB 135mm cooling fan employs a 0dB dynamic fan control; it automatically stops when the power output is less than 30%, operates in silent mode between 30-50% load, and gradually increases the fan curve when the load exceeds 50%.

Apart from the larger fan, this new power supply adheres to the Intel ATX 3.0 specification, featuring a native PCIe 16-pin 12VHPWR power supply. This caters to the upgrade needs of new RTX 40 series users. With a PCIe 6+2 Pin connector, users can utilize both new and old cards. Additionally, the GX-750W ATX 3.0 has earned 80 PLUS Gold certification as well as Cybenetics Gold efficiency and A-level noise certification.

The updated FOCUS GX ATX version 3.0 is also available in 750W, 850W, and 1000W specifications and incorporates multiple protection mechanisms such as OPP, OVP, UVP, OCP, OTP, and SCP. It also includes a 10-year product warranty. The power supply features high-quality, “all-black circular weaving pattern embossed wires” to simplify cable management and system assembly for users.

The outer package of Seasonic FOCUS GX-750W ATX 3.0 is mainly marked with the words ATX 3.0 / PCIe 5.0 COMPLIANT.
There are product features and conversion efficiency charts on the back.
Accessories include documentation, Velcro felt and straps for the entire line, a power-on test plug, and power cord.

The updated FOCUS GX-750W ATX 3.0 not only keeps its compact 14cm form factor but also features an upgraded cooling shroud on top. It now comes with an FDB 135mm cooling fan and a 0dB dynamic fan control. The fan will automatically halt when the power output dips below 30%. Between 30-50% load, the fan operates in silent mode and the fan curve gradually ascends as the load surpasses 50%.

New FOCUS GX-750W ATX 3.0.
The same 14cm small body.

The back of the power supply hosts the mains input, power switch, and a switch for the “0dB dynamic fan control”. When this switch is engaged, it deactivates the 0dB function. Releasing the switch turns on the 0dB dynamic fan control.

Behind the power supply.

The power module connector is distinctly marked with white lines indicating separate sockets for the motherboard (M/B), CPU/PCI-E, peripherals, and 12VHPWR power.

Power module connector.

The FOCUS GX-750W ATX 3.0 power supply is a high-capacity unit. It can output 62A, equivalent to 744W power, through a single +12V. The combined output for +5V and +3.3V is 100W.

Power meter.

The new model features a “full black circular woven pattern embossed cable”, comprising of 1 MB 20+4 Pin, 2 CPU 4+4 Pin, 1 PCIe 16 Pin 12VHPWR, 2 PCIe 6+2 Pin, 2 SATA, 1 SATA 3.3, and 1 large 4-pin module cable. These modular cables are not only high-quality but are also relatively flexible and sturdy. This makes it simpler for users to manage the cables during installation.

Embossed lines with an all-black circular weave pattern.
The motherboard has 24 pins and the cable length is 610mm.

The CPU power connection cable includes two total CPU 4+4 Pin connectors, with one connector per cable. Each of these cables has a length of 700mm.

CPU power cable.

The PCIe 16 Pin 12VHPWR cable has a length of 750mm. When using it, ensure that the cable is fully inserted into the connector, and when installing the cable, leave an allowance of 35mm or 3.5cm at the connector outlet.

Additionally, the PCIe power cable includes two PCIe 6+2 Pin connectors in total, with one connector per cable, and each cable is 750mm long. Having one connector per line aligns with the high-load requirements of current high-end cards, thus preventing the issue of automatic shutdown due to excessive load on a single line.

PCIe 16 Pin 12VHPWR cable.
Two PCIe 6+2 Pin connectors.
When connecting PCIe 16 Pin 12VHPWR, make sure the plug is fully inserted, and keep 3.5cm without bending.

The SATA power cable provides a total of 8 SATA connectors and is 950mm long. The cable features a Y-shaped wiring configuration. This prevents bending due to power cable intrusion when installing a 2.5 / 3.5-inch device in the case, ensuring the power connector won’t get stuck during the connection.

Additionally, there is a power cable 690mm long with 3 large 4-pin connectors and two 550mm SATA 3.3 connectors.

SATA power cable.
The Y-shaped configuration of the SATA power supply addresses issues encountered when a 2.5-inch device is mounted close to the backplane. This design prevents the SATA power connector from getting stuck due to a lack of space.

The FOCUS GX-750W ATX 3.0 power supply utilizes active PFC, LLC full-bridge resonance and a DC-DC synchronous rectification design for a single-channel 12V output. Internally, the power supply components are orderly arranged and constructed with top-notch manufacturing processes. Furthermore, it features an FDB 135mm cooling fan for efficient thermal management.

The internal configuration of the power supply.
FDB 135mm cooling fan.

Seasonic FOCUS GX-750W ATX 3.0 stress test with i9-13900K and RTX 4060

In terms of testing, we used the OCCT stress test software to conduct a dual load test on the CPU and GPU. We then checked the motherboard’s reported voltage conditions for +12V, +5V, and +3.3V through the software. We monitored changes in GPU power consumption and current when testing games with the NVIDIA PACT tool. The hardware used for these tests was an Intel Core i9-13900K processor and an RTX 4060 graphics card.

Test Platform:

  • Processor: Intel Core i9-13900K
  • Motherboard: ROG MAXIMUS Z790 HERO
  • Memory: Corsair DOMINATOR PLATINUM RGB DDR5 5400 32GBx2
  • Display Card: GIGABYTE GeForce RTX 4060
  • System Disk: Solidigm P44 Pro 1TB PCIe 4.0 SSD
  • Radiator: 360mm AIO water-cooled radiator
  • Power supply: Seasonic FOCUS GX-750W ATX 3.0
  • Operating system: Windows 11 Pro 22H2

We stress-tested the CPU and GPU using OCCT. The motherboard’s voltage information revealed that the +12V voltage remained very stable, as did the +5V and +3.3V. These stable wattage outputs satisfy the requirements of high-end CPUs and GPUs.

OCCT Stress Test.
HWINFO motherboard sensor values.
Double burn test 573W.

Next, we utilized the NVIDIA PACT tool. During standby, the third set of 12V3 voltage measured approximately 12.08V / 0.521A / 6.3W, and the PCIe Slot of the graphics card had a power consumption of around 17W.

We then used “Cyberpunk 2077” at 1440p resolution, with extremely high acceleration, and DLSS 3 performance settings. The GPU’s average power consumption came to around 119W, peaking instantaneously at 154W. The 12V3 current also reached 6.4A.

Standby 12V3.
“Dian Yu Ren Ke 2077” GPU power consumption.

Lastly, with the Furmark Xtreme burn-in test, the GPU averaged a power consumption of 121W, peaking momentarily at 133.3W. The 12V3 was measured at 11.9V, 7.5A, with a power consumption of 90W.

Furmark Xtreme burn-in GPU power consumption.


Haiyun’s latest addition to its mainstream lineup is the new FOCUS GX-750W ATX 3.0 power supply, adhering to ATX 3.0 / PCIe 5.0 specifications. This model maintains a compact 14cm body, upgrades to an FDB 135mm cooling fan, includes hybrid 0dB fan control functionality, and is certified with 80 PLUS Gold and Cybenetics Gold for efficiency and Class A for noise.

This power supply features high-quality, easy-to-install, all-black circular weave pattern embossed cables, with available specifications from 750W and 850W up to 1000W, catering to the needs of various mainstream users. In Taiwan, the new FOCUS GX-750W ATX 3.0 power supply is priced at $3790, marking a $400 difference from the previous generation GX-750 priced at $3390.

While both the new and old versions offer a 10-year warranty, if you’re a user looking to build a new system, it’s recommended to opt for the new FOCUS GX-750W ATX 3.0 version. If your currently installed card still uses PCIe 6+2 pins, it’s no concern – when you have the opportunity to upgrade in the future, you can directly connect the 12VHPWR native power cable, eliminating the need for the adapter cable that comes with the graphics card. Additionally, the ATX 3.0 specification provides high tolerance for the instantaneous overloading of the new generation of CPUs and GPUs.

If you buy a new power supply and upgrade your graphics card in the future, you can also go straight to 12VHPWR.
To match RTX 4090, FOCUS GX-1000W ATX 3.0 is also no problem.

In conclusion, as power supplies progressively transition to the ATX 3.0 specification, the choice is up to the user. Whether you opt for a new power supply to go along with new hardware when building a system, or you choose to upgrade your old hardware and select the previous generation power supply for its better cost-effectiveness, it’s part of the fun and flexibility of DIY computing.

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Title: Unboxing the Seasonic FOCUS GX-750W ATX 3.0 Power Supply / Compact 14cm Design, 12VHPWR, Gold Standard A Certification