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White fully modular ATX power supply with 120mm fan and sleeved cables

SAMA

SAMA GT850-White 850 W power supply

SKU CH-9M2W-GV12C MPN GT850-White

Fully modular 850 W ATX 3.1 unit with 80 PLUS Gold efficiency, Japanese capacitors and a native 12V-2x6 connector for RTX 4090 graphics cards

  • Max wattage850 W
  • Modular cablingFull Modular
  • Fan configuration120 mm ECO Fan
  • Main power connector1× 20+4pin
  • 12V rails12 V 3.1 × 1
  • PCIe power connectors2 × 6+2pin

Certification Series Gold GT Series

Wattage 850W

Color White

  • 80 PLUS Gold efficiency keeps energy waste low
  • ATX 3.1 standard supports modern high-performance builds
  • Fully modular cabling reduces clutter inside the case
  • Japanese capacitors deliver stable power under load
  • Native 12V-2x6 connector plugs directly into RTX 4090 graphics cards

850 W ATX 3.1 power supply

The SAMA GT850-White is an 850 W fully modular ATX 3.1 unit with 80 PLUS Gold efficiency and Japanese capacitors. It includes a native 12V-2x6 connector for direct GPU power delivery and a 120 mm FDB fan with auto speed control. The design targets builders who want clean cable routing and modern connector support.

Suited to high-end GPU builds.

This unit fits systems built around a single flagship graphics card such as the RTX 4090 where ATX 3.1 compliance and a native 12V-2x6 cable simplify installation. Builders planning dual-GPU configurations or workloads that regularly exceed 850 W should consider a higher-capacity platform instead.

850 W continuous with >11 ms hold-up

The +12 V rail delivers the full 850 W rating with a hold-up time greater than 11 ms, giving comfortable headroom for a top-tier GPU and CPU combination. Sustained loads beyond the rated maximum will trigger overload protection, so the practical ceiling remains the stated 850 W figure.

How it compares

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

Price $56.99
Cheaper than about 87% 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 lineGT Series
Model nameGT850-White
Part numberGT850-WHGFFXX1-US
Product typeATX 12 V v3.1
Product colorWhite
Ports & slots
PCIe power connectors2 × 6+2pin
Output type+3.3 V@20A, +5 V@20A
Connection types1 × 24-pin ATX (24-pin)
2 x ATX 12 V/EPS12 V (4+4-pin)
1 × 12 V-2 × 6
3 x PCIe (6+2)
6 x SATA
2 x IDE
Power
Max wattage850 W
Modular cablingFull Modular
Main power connector1× 20+4pin
12V rails12 V 3.1 × 1
Power good signalATX
Power hold-up time>11 ms
Overvoltage protectionYes
Overload protectionYes
Supply voltage100-240 V
AC input frequency50-60 Hz
Rated input current10A
Built-in protectionOPP, OVP, UVP, OCP, OTP, SCP, OPP, SIP
Power factor correctionActive PFC
Size & build
Product dimensions140 × 150 × 86 mm
Product weight2.12kg
Compatibility
PSU length limit150 mm
In the box
Included itemsGT850+Cable +accessory+Quick Start Guide
More details
Fan configuration120 mm ECO Fan
Mean time between failuresOver 100,000 h at 25? and 100% load excluding the DC Fan.
Fan LEDNo

Other versions of this model

5 more in the same range

Questions about this item

Will the native 12V-2x6 connector power an RTX 4090 without an adapter?

Yes, the unit includes a native 12V-2x6 cable that plugs directly into the graphics card, so no adapter is required for an RTX 4090.

Does the 850 W rating cover a high-end GPU and CPU together under full load?

The single 12 V rail delivers the full 850 W, which is sufficient for a top-tier graphics card and a modern processor running simultaneously.

Is the power supply compatible with a standard ATX case and motherboard?

It follows the ATX 12V v3.1 form factor and provides a 20+4 pin main connector, fitting standard ATX cases and motherboards.

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