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Black rectangular ATX power supply unit with fixed cables and a 120mm fan grille

SAMA

SAMA B850BK 850W ATX 3.1 power supply

SKU CH-B51V-4B9P0 MPN B850BK

Delivers 850W via ATX 3.1 with a PCIe 5.1 12V-2x6 connector for 450W GPU power, Cybenetics Bronze efficiency, APFC + LLC + DC-DC topology and a 120mm FDB fan in a non-modular design

  • Max wattage850 W
  • Power efficiency'>90% @ Typical Load (50% Load)
  • Modular cablingNo
  • SLI supportReady
  • CrossFire supportReady
  • Fan configuration120 mm FDB Fan (Fluid Dynamic Bearing)

Certification Series Bronze B Series

Wattage 850W

Color Black

  • ATX 3.1 and PCIe 5.1 ready for next-gen GPUs
  • 12V-2x6 connector delivers up to 450W to modern graphics cards
  • Cybenetics Bronze certified for over 90% efficiency at typical 50% load
  • APFC + LLC + DC-DC topology provides stable voltage regulation under load
  • Full protection suite including OVP, UVP, OCP, OPP, OTP and SCP safeguards components

ATX 3.1 Power Supply for Modern Builds

The SAMA B850BK is an 850W ATX 3.1 power supply built for modern gaming systems and PC builds. It provides reliable and stable power delivery for demanding components. The non-modular design includes all essential cables fixed to the unit.

PCIe 5.1 12V-2x6 Connector Limits

This unit includes a PCIe 5.1 ready 12V-2x6 connector delivering up to 450W for next-generation graphics cards. The main ATX 24Pin cable reaches 550mm for standard routing. Six SATA power connectors support multiple storage drives.

Cybenetics Bronze Efficiency Rating

Certified by Cybenetics Bronze, the PSU achieves over 90% efficiency at typical 50% load. The APFC + LLC + DC-DC topology ensures stable voltage regulation across workloads. Full protection circuits include OVP, UVP, OCP, OPP, OTP and SCP.

How it compares

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

Price $41.99
Cheaper than about 92% 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 nameSAMA
Product lineB850
Model nameB850BK
Part numberB0850-BKBFWA31-US
Product typeATX3.1
Product colorBlack
Performance
Frequency50/60 Hz
Graphics
SLI supportReady
CrossFire supportReady
Ports & slots
SATA power connectors6x
Output type850 W
Connection types1x ATX 24Pin, 2x CPU 4+4Pin, 3x PCI-E 6+2Pin, 6x SATA, 2x Molex
Power
Max wattage850 W
Power efficiency'>90% @ Typical Load (50% Load)
Modular cablingNo
Power factor correctionActive
Main power connector1x ATX 24Pin 550 mm
12V railsSingle
Power hold-up time> 12 ms @ 100% load
Overvoltage protectionYes
Overload protectionYes
Supply voltage100–240 V
AC input frequency50-60 Hz
Rated input current10A
Built-in protectionUVP / OVP / OCP / OPP / OTP / NLP / SCP
Rated power850 W
Efficiency certification80 PLUS BRONZE Certified
+3.3V max. current15A
+5V max. current15A
+12V1 max. current70.8A
-12V max. current0.4A
+5VSB max. current2.5A
Under voltage protectionYes
Over current protectionYes
Over power protectionYes
Size & build
Size or dimensions140 × 150 × 86 mm
Product dimensions140 × 150 × 86 mm
Product weight1.46kg
Top fans size120 mm
Compatibility
Haswell compatibilityYes
PSU length limit140 mm
In the box
Included itemsB850+Cable +accessory+Quick Start Guide
Fans total quantity1
Environment & compliance
PSU noise ratingTba
Regulatory approvalsCB / CE / TUV / cTUVus / FCC / ICES / UKCA / EAC
Over temperature protectionYes
More details
Fan configuration120 mm FDB Fan (Fluid Dynamic Bearing)
Mean time between failures100,000 h
Over load protectionYes
Short circuit protectionYes

Other versions of this model

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Questions about this item

Should I choose this 850W model or a lower-wattage unit for a GPU that needs the 12V-2x6 connector?

The 12V-2x6 connector on this unit is rated for up to 450W, so the 850W capacity leaves headroom for the rest of the system.

What does the 850W rating mean when the 12V-2x6 port can deliver 450W?

The 850W is the total continuous output across all rails; the 450W figure is the maximum the single 12V-2x6 connector can supply to a graphics card.

Does the ATX 3.1 and PCIe 5.1 readiness limit the power I can draw through the 12V-2x6 cable?

The 12V-2x6 connector included with this ATX 3.1 unit is specified for up to 450W, which is the practical ceiling for that cable.

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