Power Supply Unit Silverstone SST-EX850R-PM 850 W

The Silverstone SST-EX850R-PM 850 W is a compact SFX power supply designed for high-performance PCs. It supports the Gen5 12VHPWR PCIe connector and complies with the Intel SFX 12V V4.0 specification. The unit delivers a single powerful +12V rail, uses all-Japanese electrolytic capacitors and carries Cybenetics Platinum efficiency certification. Fully modular flat array cables and a 135 mm FDB cooling fan with intelligent stop and delayed shut-off provide flexible installation and quiet operation.

Advantages

The PSU provides an 850 W output with a robust single +12V rail suited for future high-end GPU upgrades and overclocking. It includes modern connectivity such as the Gen5 12VHPWR PCIe connector and a 20-pin ATX motherboard connector. High-quality Japanese electrolytic capacitors and Cybenetics Platinum efficiency support reliable, efficient performance while the fully modular flat cables simplify cable management. The ultra-silent 135 mm Fluid Dynamic Bearing fan with intelligent stop reduces noise during low loads.

Suitable for

• Compact SFX gaming PCs and small-form-factor workstations
• High-performance builds requiring an 850 W single +12V rail
• Systems with modern Gen5 12VHPWR PCIe graphics cards
• Environments where quiet cooling and modular cabling are desired

Key specifications

• Total power: 850 W
• Efficiency: 91% (Cybenetics Platinum)
• Connector: Gen5 12VHPWR PCIe; 20-pin ATX motherboard connector
• Form factor: SFX; dimensions 125 x 100 x 63.5 mm
• Fan: 135 mm Fluid Dynamic Bearing (FDB) with intelligent stop
• Cabling: Fully modular, flat array cables; SATA power cable lengths: 100 / 200 / 300 mm
• Capacitors: All Japanese electrolytic capacitors
• Weight: 1.6 kg
• Input voltage range: 180–264 V AC
• Color: Black
• Protections: Over-current, over-power, over-voltage, short circuit, under-voltage, over-temperature

How to use

Install the Silverstone SST-EX850R-PM into an SFX-compatible case following the case and motherboard manuals. Connect the 20-pin ATX cable to the motherboard and use the Gen5 12VHPWR PCIe connector for supported graphics cards. Attach SATA and peripheral cables as required using the fully modular connectors. Ensure the AC input is within the specified 180–264 V range before powering on. The fan will operate automatically and enter intelligent stop mode at low load; delayed shut-off prevents abrupt stops.

Recommendations

Use this PSU in systems that match its SFX form factor and power requirements. Verify compatibility of the Gen5 12VHPWR connector with your GPU and keep ventilation unobstructed to maintain cooling and prolong component life.