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Compact black SFX power supply with 92 mm fan and modular cable sockets

Silverstone Technology

Silverstone Technology EX850R-PM 850 W SFX power supply

SKU CH-370A-YJZMD MPN EX850R-PM

A fully modular SFX power supply delivering 850 W with Cybenetics Platinum efficiency and a 12VHPWR connector for modern graphics cards

  • ColorBlack
  • TypeSFX12V
  • Maximum Power850 W
  • Fans1 x 92 mm
  • PFCActive
  • Max PSU Length125 mm
  • Cybenetics Platinum certification delivers >=89% &
  • Gen5 12VHPWR connector meets Intel SFX 12V V4.0 specification
  • 850 W continuous output at 50°C operating temperature
  • 92 mm FDB fan with intelligent deactivation for 0 dBA minimum noise
  • Fully modular flat cables enable tighter folding in compact builds

SFX12V 4.0 850 W power supply

This SFX12V 4.0 unit delivers 850 W in a compact form factor. It targets small-form-factor builders who need high output for modern GPUs. The fully modular design uses flexible flat cables for tight routing. All Japanese electrolytic capacitors support long-term reliability.

SFX12V 4.0 interface limits

The SFX12V 4.0 standard defines the physical envelope and the 12VHPWR connector pinout. Input voltage must sit between 180 and 264 V at 47 to 63 Hz. Overall efficiency is rated between 89 and 91 percent under Cybenetics Platinum. The 92 mm FDB fan can stop at low load for 0 dBA minimum noise.

12VHPWR connector decides fit

A single 12VHPWR 12+4 pin connector is the only Gen5 PCIe 5.0 power interface on this unit. If the graphics card requires that connector, this supply matches; if it uses legacy 6+2 pin only, the extra adapter adds bulk. No other specification overrides this connector requirement.

Highlights

  • Cybenetics Platinum certification delivers >=89% &
  • Gen5 12VHPWR connector meets Intel SFX 12V V4.0 specification
  • 850 W continuous output at 50°C operating temperature
  • 92 mm FDB fan with intelligent deactivation for 0 dBA minimum noise
  • Fully modular flat cables enable tighter folding in compact builds

Specifications

BrandSilverStone
ModelExtreme 850R Platinum
Part NumberEX850R-PM
ColorBlack
TypeSFX12V
Maximum Power850 W
Fans1 x 92 mm
PFCActive
Max PSU Length125 mm
ModularFull Modular
Efficiency>= 89% & <91% overall efficiency
Energy-EfficientCybenetics Platinum
ProtectionOver Current Protection
Over Power Protection
Over Voltage Protection
Short Circuit Protection
Under Voltage Protection
Over Temperature Protection
No load operation
Input Voltage180 - 264 V
Input Frequency Range47 - 63 Hz
MTBF100,000 Hours
Connectors1 x 12VHPWR (12+4) PCIe / 1 x 24 pin (20+4) ATX / 1 x 8 pin (4+4) EPS (CPU) / 1 x Floppy / 2 x 8 pin (6+2) PCIe / 3 x 4 pin Peripheral / 8 x SATA
Dimensions125 x 63.5 x 100 mm
Weight3.53 lbs.
Shipping weight2.27 kg
Package size25 × 25 × 25 mm

Questions about this item

Will this SFX unit fit in a case that only accepts standard SFX dimensions?

The housing measures 125 x 63.5 x 100 mm, matching the SFX form factor, so it fits any chassis designed for that size.

Can I power a modern graphics card that requires the 12VHPWR connector without an adapter?

Yes, the supply includes a native 12+4 pin 12VHPWR cable that meets the Intel SFX 12V V4.0 specification.

Is the fan completely silent at low loads?

The 92 mm FDB fan can deactivate entirely, delivering 0 dBA minimum noise until the internal temperature rises enough to require active cooling.

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