GameMax GX-850 PRO 850W ATX Power Supply
£101.46
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About This Item
- 850W ATX3.1 power supply with 80 Plus Gold certification
- Active cooling with 13.5 cm fan and 25 dB noise level
- Fully-modular cabling design for clean build
- Six SATA power connectors and four PCIe 6+2 pin connectors
- Compact 160 x 150 x 85 mm form factor
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GameMax GX-850 PRO | 850W ATX3.1 Gold PSU with PCIe5.1
The GameMax GX-850 PRO power supply unit 850 W 20+4 pin ATX ATX White delivers 850W of clean, efficient power with 80 PLUS Gold certification and ATX3.1 compliance. Designed for high-performance gaming PCs, it features a PCIe5.1 12V-2*6 connector for direct RTXâ„¢ 40 Series GPU connection, minimising current loss and maximising stability.
Key Specifications
| Metric | Spec |
|---|---|
| Total Power Output | 850 W |
| Efficiency Rating | 80 PLUS Gold |
| PSU Form Factor | ATX |
| ATX Version | 3.1 |
| Cooling | Active (13.5 cm fan) |
| Noise Level | 25 dB |
| MTBF | 100,000 hours |
Direct RTXâ„¢ 40 Series GPU Connection
The GX-850 PRO includes a PCIe5.1 12V-2*6 connector specifically engineered for next-generation graphics cards. This dedicated connector reduces current loss compared to traditional PCIe cables, ensuring your RTXâ„¢ 40 Series GPU receives stable, clean power for optimal performance during intensive gaming sessions.
Fully Modular Cable Management
With fully-modular cabling, you connect only the cables your build requires. This reduces clutter inside your case, improves airflow, and makes installation cleaner. The included cables feature lengths of 65 cm for motherboard, 15 cm for CPU, and SATA cables at 500/650/800 mm for flexible routing options.
High-Efficiency Power Delivery
Achieving 87% efficiency under typical loads, the 80 PLUS Gold certification means less wasted energy and lower operating temperatures. The active Power Factor Correction (PFC) with a 0.99 power factor ensures your system draws power efficiently from the mains, reducing electricity costs and environmental impact.
Robust Protection and Reliability
Built with comprehensive protection features including over current, over power, surge & inrush protection (SIP), and under power safeguards. The 100,000-hour MTBF rating demonstrates exceptional reliability for continuous operation, while the 10 ms hold time maintains power during brief interruptions.
Package Contents
- GameMax GX-850 PRO power supply unit
- Fully modular cables (as specified)
- User manual
- Mounting screws
Key points to check
- Confirm your PC case supports standard ATX power supply dimensions (160 x 150 x 85 mm)
- Verify your GPU requires PCIe5.1 connectivity or will use standard PCIe connectors
- Check your system’s total power draw against the 850W capacity
- Ensure your location’s voltage (100-240V) matches the PSU’s input range
Common questions
Does this PSU support Intel ATX3.1 specification?
How many PCIe 6+2 pin connectors are included?
What is the noise level during operation?
Is the power supply fully modular?
What protection features does this PSU have?
Summary & warranty
The GameMax GX-850 PRO power supply unit 850 W 20+4 pin ATX ATX White represents excellent value for gamers building high-performance systems with RTXâ„¢ 40 Series GPUs. Its ATX3.1 compliance, PCIe5.1 connectivity, and 80 PLUS Gold efficiency make it future-proof for demanding components. Covered by the applicable manufacturer warranty.
| Weight | 2.6 kg |
|---|---|
| Purpose | PC |
| ATX version | 3.1 |
| Noise level | 25 dB |
| Mean time between failures MTBF | 100000 h |
| Product colour | White |
| Fan diameter | 13.5 cm |
| On/off switch | Yes |
| Number of fans | 1 fan(s) |
| Cooling type | Active |
| 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 +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 +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% |
| 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 |
| Operating temperature T-T | 0 – 40 °C |
| Width | 160 mm |
| Depth | 150 mm |
| Height | 85 mm |
| Package type | Box |
| Compliance certificates | CB, CE, Federal Communications Commission (FCC), cTUVus |
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