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Black rectangular ATX power supply with a 120 mm fan and green-accented cables

ASRock

ASRock PRO-850B 850 W power supply

SKU CH-JD8E-YS2SA MPN PRO-850B

An 850 W ATX 3.1 power supply with 80 PLUS Bronze efficiency, a 120 mm fan, native 12V-2x6 PCIe 5.1 connector and full protection suite

  • ColorBlack
  • TypeATX 3.1 Compatible
  • Maximum Power850 W
  • Fans1 x 120 mm
  • Max PSU Length140 mm
  • Energy-Efficient80 PLUS BRONZE Certified

Option 850W

  • 80 PLUS Bronze certification reduces wasted energy
  • ATX 3.1 and PCIe 5.1 ready for modern graphics cards
  • Native 12V-2x6 dual-color connector simplifies installation
  • 120 mm fan keeps noise low under load
  • Over 100000 hours MTBF indicates long service life

850 W ATX 3.1 Power Supply

The ASRock PRO-850B is an 850 W ATX 3.1 compatible power supply with 80 PLUS Bronze certification. It uses a single 120 mm fan and measures 140 mm in length. A full suite of protections including OCP, SCP, OVP, UVP, OTP and OPP is built in. The unit carries a three-year manufacturer warranty.

For Value-Focused Builds Needing PCIe 5.1

This unit suits builders who want a native 12V-2x6 connector for modern graphics cards and dual-colour cables that confirm a secure fit. It is not for systems that require more than one EPS 12V CPU connector or more than two 6+2-pin PCIe connectors. Buyers needing higher efficiency ratings or additional peripheral connectors should look at other options.

Check Clearance and Connector Counts

Verify that your case accepts a power supply up to 140 mm long and 150 mm wide. Confirm the motherboard needs only one 4+4-pin CPU power connector. Ensure the graphics card can run from a single 12V-2x6 connector or the two 6+2-pin leads provided. Count SATA and 4-pin peripheral devices against the four and two ports available.

Highlights

  • 80 PLUS Bronze certification reduces wasted energy
  • ATX 3.1 and PCIe 5.1 ready for modern graphics cards
  • Native 12V-2x6 dual-color connector simplifies installation
  • 120 mm fan keeps noise low under load
  • Over 100000 hours MTBF indicates long service life

Specifications

BrandASRock
SeriesPRO Series
ModelPRO-850B
ColorBlack
TypeATX 3.1 Compatible
Maximum Power850 W
Fans1 x 120 mm
Max PSU Length140 mm
Energy-Efficient80 PLUS BRONZE Certified
ProtectionOCP, SCP, OVP, UVP, OTP, OPP
MTBF>100,000 Hours
Cable SpecMotherboard cable (24pin): 1
EPS 12V CPU connectors (4+4pin): 1
PCIe5.1 connectors(12+4pin) Dual Color: 1
PCIe connectors (6+2pin): 2
4-pin Peripheral connectors: 2
SATA 5-pin connectors: 4
Dimensions140 x 150 x 86mm
Shipping weight1.81 kg
Package size267 × 203 × 102 mm

Other versions of this model

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Same family, different memory, cooler or clock — compare before you commit.

Questions about this item

Does this PSU include a native 12V-2x6 PCIe 5.1 connector for modern GPUs?

Yes, it ships with one PCIe 5.1 12+4-pin dual-colour cable rated for the 12V-2x6 standard.

Will the 140 mm depth fit inside my existing ATX case?

The unit measures 140 mm deep, so any case that accepts standard ATX power supplies up to that length will accommodate it.

How can I confirm the 24-pin and EPS cables are fully seated after installation?

The motherboard and CPU connectors use ASRock Classic Green housings that make a visible colour change when the latch clicks into place.

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