Today we’re ripping into the Segotep GM750W Gold Full-Modular PSU, a unit built to the latest ATX 3.1 spec with a native 16-Pin 12V-2x6 header primed for PCIe 5.1 GPUs. Under the hood, it adopts a high-efficiency Active PFC + half-bridge LLC + SR + DC-DC architecture, cruising through with an 80PLUS Gold badge and a 750W output that perfectly hits the sweet spot for budget-conscious mainstream PC builds.

Internally, it reveals a premium bulk cap on the primary side and crisp solid caps handling the output filtering, all tied together with a 5-year warranty. The full-modular design comes packed with black embossed ribbon cables for an ultra-clean cable management setup.

Let’s dive straight into ChargerLAB's teardown to see exactly what kind of hardware and silicon layout Segotep is packing inside.

Product Appearance

Teardown of Segotep 750W ATX 3.1 Dual-Gold Full-Modular PSU SG-850G-Chargerlab

This Segotep PSU box sports a stealthy black backdrop, with the Segotep logo running vertically down the left side, the GM750W badge stamped dead center, and a clean shot of the power brick's exterior underneath.

The back of the box lists the PSU's key features in multiple formats and stamps the official manufacturer details at the bottom.

Here is the PSU chassis, power cord, and modular cable arrays straight out of the box. The main PSU chassis comes wrapped in EPE foam for optimal shock absorption.

The bundled modular cables are secured with integrated hook-and-loop fasteners.

Here is the type and length specs for the bundled modular cables.

The GPU modular cable is officially stamped with a 450W power limit spec.

Here is the 24-Pin main PCB modular cable.

Here is the PCIe 8Pin modular cable.

Here is the peripheral modular cable.

The power cord is secured with integrated cable ties.

The length of the power cord is about 1,2m (47.244 inches).

These are the chassis mounting screws and cable ties.

The top of the power supply integrates a cooling fan shielded by a protective grille to keep foreign debris out.

The protective grille features the Segotep brand logo.

The side of the power supply features a specs label denoting the GM750W model, with ATX 3.1 and PCIe 5.1 standards, alongside official 80 PLUS Gold and CYBENETICS GOLD badges.

Full breakdown of the model and power rails on the right side：

PSU Model: SG-850G

AC Input: 100-240Vac, 12-6A, 47-63Hz

DC Output: +12V 62A 744W

+5V 15A, +3.3V 16A 103W

-12V 0.3A 3.6W

+5Vsb 2.5A 12.5W

Total Output: 750W

Manufacturer: Huizhou Segotep Electronic Technology Co., Ltd.

The input end features the standard power receptacle and a heavy-duty power switch.

The output end features a dual-row modular connector matrix.

The upper row of the modular connector matrix is dedicated to GPU and main PCB power delivery, while the lower row is power supply to GPU, peripheral, and CPU.

The base of the PSU is with integrated mounting screw holes for chassis retention

The length of the PSU is about 139.8mm (5.504 inches).

The width of the PSU is about 150.1mm (5.909 inches).

The thickness of the PSU is about 85.9mm (3.382 inches).

That's how big it is in the hand.

The weight is about 1228g (43.32 oz).

Teardown

Now that we are done checking out the PSU’s looks and inbox goodies, let’s crack it open and dive straight into the internal architecture and hardware components.

First, unscrew the mounting screws and pop open the PSU casing.

The cooling fan is interconnected via a dedicated terminal connector assembly.

Inside the top panel, a cooling fan pairs up with a baffle to route the breeze.

The cooling fan is from Xunyuda, model DF1202512RFLN, 12V 0.16A.

The PCBA is screwed tightly into the casing, shielded from the metal shell by a transparent sheet for insulation.

Removing the retaining screws to disassemble and extract the PCBA from the housing base.

The safety X2 cap is from NDF, 1μF.

The blue Y cap is from NDF, 222M.

A view of the PCBA layout, The bottom-right corner handles the AC input entry, packing the fuse, common-mode choke, NTC thermistor, relay, and MOV, followed inline by another common-mode choke and the safety X2 cap. That long strip heatsink on the left cools down the rectifier bridge, PFC MOSFET, PFC rectifier, and LLC MOSFET. The bottom-left area holds the film filter cap and the PFC boost choke, while the high-voltage filter cap sits right in the middle-left.

Up top is the modular output PCB. The top-left corner sports the resonant cap and resonant choke, while the main transformer sits to the right of the vertical heatsink. To the right of the transformer, you’ll find the synchronous rectifier MOSFETs, synchronous rectifier controller, and filter caps. Right under the transformer sit the standby power supply chip and standby transformer, with the 3.3V and 5V step-down circuits flanking the right side.

The back of the PCBA is devoid of components, featuring exposed traces with solder along the high-current pathways to boost power delivery.

A side view of the PCBA, On the right sits the input fuse. Moving left, we find the common-mode choke, NTC thermistor, relay, MOV, another common-mode choke, and the safety X2 cap. The left side holds the film caps, the PFC boost choke, and the rectifier bridge.

The input fuse is rated for 12.5A 250V.

The common-mode choke is wound with a combination of enameled wire and insulated wire.

The relay is from Yuanze, model Y32F-SS-112HM, is used to bypass the NTC thermistor. Rated 10A 250VAC, run on 12V.

A NTC thermistor, marked 2.5D-15.

The MOV is from Hongzhi, model 10D561K, utilized for transient overvoltage surge absorption.

The common-mode choke is wound with high-density flat copper wire.

The safety X2 cap is from Jingyu, the CBBX2 series, 0.68μF.

A blue Y cap is interposed between the safety X2 cap and the common-mode choke.

The common-mode choke is wound with high-density flat copper wire.

The left side of the heatsink is populated with the rectifier bridge, while the PFC MOSFETs and the PFC rectifier MOSFETS sit in the middle, and the LLC MOSFETs is on the right.

The other side of the heatsink is populated with an additional rectifier bridge.

The rectifier bridge is from HG, model GBU30K, 30A 800V, in GBU package.

The film filter cap is from Jingyu, the CBB23 series, 450V 1μF.

The PFC controller is from Youwang, model YW8330. It is a high-PF PFC chip that integrates internal protection circuitry, including soft-start, OCP, OVP, and UVLO. It features low startup and operating currents while utilizing average current mode control. It is perfectly suited for applications such as PC power supplies, power adapters, UPS systems, and fast chargers, and is housed in an SOP-14 package.

Here is the info about Youwang YW8330.

The PFC MOSFET is from Infineon, model IPW60R060P7, the CoolMOS P7 series. It is an N-channel MOSFET, 650V and 60mΩ, in TO-247-3 package.

The PFC rectifier MOSFET is from YASC, model Y3D010N065T2J, 650V and 10A, in TO-220-2 package.

Two 70mΩ current-sensing resistors are configured in parallel to monitor the PFC MOSFET current.

The side profile of the PCBA is populated with the PFC boost choke, the high-voltage filter cap, the LLC resonant choke, and the LLC resonant cap.

The PFC boost choke is wound with high-frequency Litz wire.

This is the PFC bypass MOSFET.

The high-voltage filter cap is from ChengX, the CP series of high-ripple current resistant aluminum electrolytic caps, 680μF 420V, rated for 105℃.

The LLC controller is from Youwang, model YW6599. It is a control chip designed for resonant half-bridge topologies, providing a fixed 50% duty cycle with a switching frequency capability up to 500KHz. It features variable frequency and latching OCP. Additionally, it supports active PFC linkage switching control, light-load pulse mode, and integrates an internal bootstrap MOSFETS, in SOP-16 package.

Here is the info about Youwang YW6599.

The filtering cap supplying power to the main controller, 22μF 50V.

The LLC MOSFET is from Oriental Semiconductor, model OSG55R160FZF. It is an N-channel MOSFET, 600V and 160mΩ, in TO-220F package.

The resonant cap is from Jingyu, 1KV 0.1μF.

The resonant choke is wrapped with insulating tape and utilizes an EQ25 magnetic core.

The LLC transformer utilizes a PQ3230 magnetic core, with the secondary winding constructed from high-current flat copper wire.

The blue Y cap is from NDF, part number 222M.

The synchronous rectifier controller is from NXP, model TEA1995. It integrates dual independent synchronous rectification drivers specialized for secondary-side rectification in LLC resonant architecture switching power supplies. It offers a highly streamlined peripheral component count, supports a 38V working voltage, and in SO8 package.

The synchronous rectifier MOSFET is from PINGWEI, model PWC016N04ES. It is an N-channel MOSFET, 45V and 1.3mΩ, in DFN5*6 package.

The opposite side mirrors this setup with a pair of identical synchronous rectifier MOSFETs.

The rectifiers feature a dedicated heatsink, with the filtering caps and filtering choke tucked underneath. The solid caps are from APAQ, the AREP series, 470μF 16V, with a total of 9 units deployed.

The electrolytic cap is from ChengX, 2200μF 16V.

This is the output filtering choke.

The step-down chip is from Anpec, model APW7164. It is a voltage-mode synchronous controller featuring a fixed 200KHz switching frequency, supporting OCP and OVP, in SOP-8 package.

A total of two step-down chip are deployed, responsible for the independent 3.3V and 5V voltage regulation outputs respectively.

The accompanying MOSFETs are from PINGWEI, model PW045N03ESL, in DFN5*6 package.

The other side mirrors this setup with a pair of identical MOSFETs.

These are two 4.7μH step-down choke.

These are the filtering caps and filtering chokes, deploying a powerhouse mix of two 470μF 16V solid caps working alongside a six-pack of 560μF 6.3V solid caps.

This is the output filtering choke.

The synchronous step-down chip is from NDP, model NDP2332KC, in SOP-8 package.

This is the 10μH alloy choke.

The filtering cap, 470μF 16V.

The standby power supply chip is from Youwang, model YW81581B. It features an integrated internal power MOSFETS and supports dual PWM and PFM operating modes. It incorporates an integrated high-voltage startup circuit to achieve ultra-low standby power consumption. Additionally, it features a comprehensive protection suite, including VCC, OVP, OLP, input undervoltage protection and TSD, in DIP-7 package.

Here is the info about Youwang YW81581B.

The filtering cap, 220μF 50V.

Another one is from GATHER, 100μF 35V.

The standby power supply transformer is wrapped with insulating tape for dielectric isolation.

The synchronous rectifier chip is from DK, model DK5V45R25S. It is a peripheral-free synchronous rectifier chip featuring an integrated synchronous rectifier MOSFET with a 45V breakdown voltage and an on-resistance of 25mΩ. It incorporates proprietary self-powering technology to directly replace traditional Schottky diodes, supporting CCM, DCM, and QR operating modes without requiring any external components, in SM-7 package.

Here is the info about DK DK5V45R25S.

The filtering cap, 220μF 16V.

The filtering choke is enclosed with a heat-shrinkable tube for dielectric insulation.

The filtering cap, 560μF 6.3V.

The voltage reference is from Youwang, model UTC431. It is a three-terminal adjustable precision shunt regulator, providing an adjustable output voltage range of 2.5-36V. It features low dynamic output impedance, low output noise voltage, and rapid turn-on response, in SOT-23 package.

Here is the info about Youwang UTC431.

Another voltage reference of the identical model is utilized, is from the Youwang UTC431.

The optocoupler is from LITEON, model LTV-817C.

The optocoupler is from EVERLIGHT, model EL817.

Another optocoupler of the identical model is utilized.

The supervisory chip is from InfSitronix, model IN1S315I-SAG. It provides comprehensive OVP and UVP for the 3.3V, 5V, and 12V rails, in SOP-8 package.

The output PCB is connected via header pins and copper busbars. The PCB houses the modular output connectors and solid filtering caps.

The filtering caps are from CapXon, 270μF 16V and 560μF 6.3V respectively.

Two filtering caps are utilized, 270μF 16V.

The filtering cap, 560μF 6.3V.

The filtering cap, 560μF 6.3V and 270μF 16V respectively.

The filtering cap, 2700μF 16V.

Well, those are all components of the Segotep 750W ATX 3.1 Dual-Gold Full-Modular PSU SG-850G.

Summary of ChargerLAB

The Segotep GM750W power supply features a sleek black aesthetic and a fully modular design, paired with black textured modular cables to meet the needs of mainstream high-value PC builds. The unit conforms to the ATX 3.1 standard and carries an 80 PLUS certification. It utilizes high-grade primary electrolytic capacitors complemented by an all-solid cap filtering array, backed by a 5-year warranty.

Technical teardown analysis reveals an Active PFC + Half-Bridge LLC + Synchronous Rectification + DC-DC high-efficiency topology. Core control logic is provided by Youwang, utilizing the YW8330 PFC controller, YW6599 LLC controller, and YW81581B standby power supply chip.

Power stage components include Infineon IPW60R060P7 PFC MOSFETs, YASC Y3D010N065T2J SiC diodes, ORIENTAL OSG55R160FZF LLC MOSFETs, and PINGWEI synchronous rectifiers. It features high-voltage caps from ChengX and solid caps from APAQ and CapXon. All critical components feature glue reinforcement for enhanced reliability and durability.