Seasonic Focus GX-750

Visual inspection

The FOCUS GX-750 has a simple design, nearly identical with that of the original Focus power supply models. The case of the power supply has a matte black finish, with no stickers placed on the front side. The power supply has a weight of 1.8kg, a width of 150mm, a height of 86mm with a length of 140mm.
The FOCUS GX-750 uses a single 120mm fan for the active cooling, which is controlled by the Seasonic Hybrid Silent fan control system.

 

The sides of the power supply are decorated with angular shapes stamped into the metal casing. On the upper and lower corners there are painted the Seasonic and Focus series emblems.

 

The back of the FOCUS GX-750 is simple in terms of layout, with a honeycomb pattern acting as the main exhaust vent of the power supply. On the left side, the AC slot and the On/Off switch are located. On the right, there is a button labeled “Hybrid mode” which will turn on or off the Seasonic Hybrid Silent fan control system.

 

At the front of the power supply there are the 10 slots for the modular cables. All these slots are labeled and marked to be easier to identify. The labels are not made from paper or plastic, Seasonic instead has decided to directly paint the writing and graphics on the metal surface of the power supply.

 

The top of the FOCUS GX-750 features the standard label which presents the main technical specifications of the power supply. This includes the serial number and a diagram of all the rails of the power supply, with the total wattage available.

 

The cables of the FOCUS GX-750 are completely black and flat ribbon style. These types of cables are easier to cable manage, thanks to their flat design. In addition, these can be stacked and tied together behind the motherboard tray for a better look. The only cable that is not flat is the 24Pin cable, which powers the motherboard. This cable is instead, covered by high quality sleeving.

 

The fan used with this power supply is manufactured by Hong Hua, and is the model HA1225H12F-Z with the specifications: 0.58A @ 12 VDC, 2200 RPM, 73.9CFM, 32.4db, 120 mm.
This fan has been used in numerous other power supplies from Seasonic and other manufacturers. The fan uses a Fluid Dynamic Bearing system, while the fan control is done by Seasonic’s three-phase Hybrid Silent system.

The fan is connected to the PCB with a 3-Pin connector, which makes it removable and easier to service.

 

The FOCUS GX-750 uses an improved Seasonic electronic platform, which shares many components and the general layout with other Focus series units. The passive cooling for the internal components is done by four solid metal heatsink which are attached to the important components of the power supply. The active cooling is done by the previously mentioned 120mm Hong Hua fan.

 

The filtering starts at the back of the power supply, behind the AC slot, with two X capacitors, four Y capacitors, and two coils. A small PCB is installed over the Y and X capacitors, and the coils installed on the underside.

 

The APFC section uses a single primary capacitor manufactured by Rubycon with the following specifications: 560uF 400V with a maximum operating temperature of 105°C.

 

The secondary PCB installed in front of the modular system has two smaller coils which are also paired with a couple of Nippon Chemi-con solid capacitors.

 

The PFC side of the power supply has a single Hongfa HF46F-G relay. On the right, some of the MOSFETs used by this unit are visible, these are manufactured by Infineon, and have the model number: 5R190CE. The MOSFETs make direct contact with the aluminum heatsink, and thus benefit from direct cooling.

 

The FOCUS GX-750 uses both Nichicon and Nippon Chemi-Con solid and standard capacitors. The only Rubycon made capacitor is the primary capacitor of the power supply.

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