GameMax GX-850 PRO 850W PSU
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About This Item
- 850W power supply with 80 PLUS Gold certification
- 13.5 cm active cooling fan with 25 dB noise level
- Fully-modular ATX3.1 design with PCIe5.1 12V-2*6 connector
- Active PFC with 0.99 power factor for efficient operation
- Comprehensive protection including over current, over power, and surge protection
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GameMax GX-850 PRO | 850W ATX3.1 Gold PSU for High-End Gaming
The GameMax GX-850 PRO power supply unit 850 W 20+4 pin ATX ATX Black delivers 850W of clean, stable power with 80 PLUS Gold certification, making it ideal for high-performance gaming PCs and workstations. Built to ATX3.1 and PCIe5.1 standards, it features a dedicated 12V-2*6 connector for direct RTX™ 40 Series GPU connection, minimising current loss and maximising efficiency.
Slim Specs Table
| Metric | Spec |
|---|---|
| Total Power | 850 W |
| Efficiency | 80 PLUS Gold |
| Form Factor | ATX |
| Cooling | Active, 13.5 cm fan |
| Noise Level | 25 dB |
ATX3.1 & PCIe5.1 Ready for Next-Gen GPUs
The GX-850 PRO meets ATX3.1 specifications and includes a PCIe5.1 12V-2*6 connector, enabling direct connection to RTX™ 40 Series graphics cards. This design reduces power loss and ensures stable delivery during peak GPU loads, crucial for maintaining performance during intensive gaming or rendering sessions.
Fully Modular Cabling for Clean Builds
With fully-modular cabling, you connect only the cables you need, reducing clutter and improving airflow inside your case. The included cables feature generous lengths—65 cm for the motherboard connector and up to 800 mm for SATA drives—making routing easier in larger chassis.
High Efficiency & Quiet Operation
Achieving 80 PLUS Gold efficiency, this PSU operates at up to 87% efficiency under typical loads, reducing heat and electricity costs. The 13.5 cm fan with active cooling keeps noise levels down to just 25 dB, ensuring quiet operation even under load.
Robust Protection & Reliability
The GX-850 PRO includes comprehensive protection features: over current, over power, surge & inrush protection (SIP), and under power safeguards. With a Mean Time Between Failures (MTBF) of 100,000 hours, it offers dependable long-term performance for demanding systems.
Box contents
- GameMax GX-850 PRO power supply unit
- Modular cables
- Mounting screws
- User manual
Check before you buy
- Confirm your case supports ATX form factor (160 x 150 x 85 mm).
- Verify your GPU requires PCIe5.1 or is compatible with the 12V-2*6 connector.
- Check your motherboard has a 20+4 pin ATX power connector.
- Ensure your power outlet matches the 100-240 V AC input range.
Frequently Asked Questions
Q: Is the GameMax GX-850 PRO compatible with RTX 40 Series GPUs?
A: Yes, it includes a PCIe5.1 12V-2*6 connector for direct RTX 40 Series GPU connection.
Q: What efficiency rating does this PSU have?
A: It is 80 PLUS Gold certified, operating at up to 87% efficiency.
Q: Is the cabling fully modular?
A: Yes, all cables are fully modular for a cleaner, more flexible build.
Q: What protections are included?
A: It features over current, over power, surge & inrush protection, and under power protection.
Q: What are the dimensions of this PSU?
A: The unit measures 160 mm wide, 150 mm deep, and 85 mm high.
The Consultant’s verdict & warranty
The GameMax GX-850 PRO power supply unit 850 W 20+4 pin ATX ATX Black is an excellent choice for gamers and professionals building high-end systems with next-gen GPUs. Its ATX3.1 and PCIe5.1 compliance, fully modular design, and robust protection features make it a reliable, future-proof power solution. Covered by the standard Manufacturer Warranty.
| Cooling | |
|---|---|
| Fan diameter | 13.5 cm |
| Number of fans | 1 fan(s) |
| Cooling type | Active |
| Performance | |
| On/off switch | Yes |
| Power supply unit (PSU) form factor | ATX |
| 80 PLUS certification | 80 PLUS Gold |
| Purpose | PC |
| ATX version | 3.1 |
| Noise level | 25 dB |
| Mean time between failures (MTBF) | 100000 h |
| Design | |
| 80 PLUS certification | 80 PLUS Gold |
| Product colour | Black |
| Fan diameter | 13.5 cm |
| On/off switch | Yes |
| Number of fans | 1 fan(s) |
| Cooling type | Active |
| Power | |
| Total power | 850 W |
| Maximum input current (@220V) | 5 A |
| AC input voltage | 100 - 240 V |
| AC input frequency | 50/60 Hz |
| Input current | 10 - 5 A |
| Power factor | 0.99 |
| Power Factor Correction (PFC) type | Active |
| Maximum input current (@110V) | 10 A |
| Combined power (+3.3V) | 100 W |
| Combined power (+12V) | 840 W |
| Combined power (+5V) | 100 W |
| Combined power (-12V) | 3.6 W |
| Combined power (+5Vsb) | 12.5 W |
| Max output current (+3.3V) | 20 A |
| Max output current (+12V) | 70 A |
| Max output current (+5V) | 20 A |
| Max output current (-12V) | 0.3 A |
| Max output current (+5Vsb) | 2.5 A |
| Power protection features | Over current, Over power, Surge & inrush protection (SIP), Under power |
| Hold time | 10 ms |
| Efficiency | 87% |
| Ports & interfaces | |
| Motherboard power cable length | 65 cm |
| SATA power cable length | 500,650,800 mm |
| CPU power cable length | 15 cm |
| Motherboard power connector | 20+4 pin ATX |
| Number of SATA power connectors | 6 |
| Number of PATA power connectors | 3 |
| PCI Express power connectors (6+2 pin) | 4 |
| CPU power connector (4+4 pin) | Yes |
| Cabling type | Fully-Modular |
| Operational conditions | |
| Operating temperature (T-T) | 0 - 40 °C |
| Certificates | |
| Compliance certificates | CB, CE, Federal Communications Commission (FCC), cTUVus |
| 80 PLUS certification | 80 PLUS Gold |
| Weight & dimensions | |
| Width | 160 mm |
| Depth | 150 mm |
| Height | 85 mm |
| Packaging data | |
| Package type | Box |
| Technical details | |
| Compliance certificates | CB, CE, Federal Communications Commission (FCC), cTUVus |
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