Power Supply Unit Cooler Master GX II Gold 850

The Cooler Master GX II Gold 850 is an 850W ATX power supply designed for reliable, efficient power delivery in desktop PCs and servers. It supports universal AC input (100–240V, 50/60Hz), provides a 24-pin ATX motherboard connector and multiple SATA power cables, and comes in a black finish. The unit is 80 PLUS Gold certified and actively cooled with a 120 mm fan to balance thermal performance and noise control.

Advantages

Built to last, the GX II Gold series adds ATX 3.1 compatibility and a durable 90-degree 12V-2x6 PCIe 5.1 connector capable of supplying up to 600W to a GPU. The PSU achieves over 90% efficiency at typical loads, uses separated thermal domains and a large-quality Japanese capacitor to reduce ripple and enhance reliability, and features a zero-RPM fan mode that keeps the fan off until a set temperature threshold is reached. Fully modular cabling helps reduce clutter and improve airflow.

Suitable for

• Gaming and high-performance desktop PCs requiring up to 850W total power
• Workstations and home servers that need reliable, efficient power delivery
• Systems using modern GPUs that benefit from the 90-degree 12V-2x6 PCIe 5.1 connector

Key specifications

• Total power: 850 W
• Efficiency: 90% (80 PLUS Gold)
• AC input: 100–240 V, 50/60 Hz
• Motherboard connector: 24-pin ATX
• Fan diameter: 120 mm
• Included PCIe connector: 90-degree 12V-2x6 (PCIe 5.1 capable, up to 600W to GPU)
• Product colour: Black
• Weight: 2.614 kg

How to use

Install the Cooler Master GX II Gold 850 into a compatible ATX case and connect the 24-pin ATX cable to the motherboard. Attach required peripheral and SATA power cables to drives and other components using the modular connectors provided. Use the 90-degree 12V-2x6 PCIe connector when connecting compatible GPUs; ensure the GPU and cables are properly seated. Confirm the AC input switch (if present) and connect to a suitable mains outlet within the specified voltage range.

Recommendations

For optimal performance, route modular cables to minimize airflow obstruction inside the case, maintain case ventilation, and monitor system temperatures. Use the PCIe 5.1 12V-2x6 connector for GPUs that require high power delivery and consult your GPU documentation to confirm connector requirements.