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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

  • Max wattage850 W
  • Power efficiency>= 89% & <91% overall efficiency
  • Modular cablingFull Modular
  • Fan configuration1 × 92 mm
  • Power factor correctionActive
  • PSU length limit125 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.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $182.99
Pricier than about 60% of the 10,869 comparable items (median $142.99).
Max wattage 850 W
Typical for this category: the median of 930 items is 850 W.

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Specifications

Product
Brand nameSilverStone
Model nameExtreme 850R Platinum
Part numberEX850R-PM
Product colorBlack
Product typeSFX12 V
Ports & slots
Connection types1 × 12VHPWR (12+4) PCIe / 1 × 24 pin (20+4) ATX / 1 × 8 pin (4+4) EPS (CPU) / 1 x Floppy / 2 × 8 pin (6+2) PCIe / 3 × 4 pin Peripheral / 8 x SATA
Power
Max wattage850 W
Power efficiency>= 89% & <91% overall efficiency
Modular cablingFull Modular
Power factor correctionActive
Efficiency certificationCybenetics Platinum
Built-in protectionOver Current Protection
Over Power Protection
Over Voltage Protection
Short Circuit Protection
Under Voltage Protection
Over Temperature Protection
No load operation
Supply voltage180–264 V
AC input frequency47–63 Hz
Size & build
Product dimensions125 × 63.5 × 100 mm
Product weight3.53 lb (1.6 kg)
Shipping weight2.27 kg
Package size25 × 25 × 25 mm
Compatibility
PSU length limit125 mm
More details
Fan configuration1 × 92 mm
Mean time between failures100,000 h

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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