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Black rectangular ATX power supply 125mm deep with 120mm fan and modular sockets

Super Flower

Super Flower Leadex VIII Platinum PRO 850W 125mm ATX 3.1 power supply

SKU CH-91A8-SSMEV

An 850 W ATX 3.1 power supply in a compact 125 mm chassis with Cybenetics Platinum efficiency, full modular cabling and a native 12V-2x6 connector for PCIe 5.1 graphics cards

  • Max wattage850 W
  • Modular cablingFull Modular
  • Fan configuration1 × 120 mm
  • Power factor correctionActive
  • Main power connector20+4Pin
  • 12V railsSingle

Model ATX 3.1 Platinum 850W Black

  • Compact 125 mm length fits tight builds while delivering 850 W platinum efficiency
  • ATX 3.1 and PCIe 5.1 native 12V-2x6 cable readies the unit for modern GPUs
  • Full modular ribbon cables simplify routing and improve airflow
  • Cybenetics Platinum certification confirms high efficiency across load ranges
  • 120 mm fluid dynamic bearing fan runs quietly under heavy load

Smallest 850W ATX 3.1 PSU

The Super Flower Leadex VIII Platinum PRO delivers 850 W in a 125 mm deep ATX chassis, making it the shortest unit in its class. Full modular ribbon cables keep builds tidy while a 120 mm fluid-dynamic-bearing fan runs quietly. Cybenetics Platinum certification confirms high efficiency across the load range. It supports ATX 3.1 and PCIe 5.1 with a native 12V-2x6 connector.

Compact-case builders and silent rigs

This unit suits small-form-factor cases that cannot accept standard-length power supplies and users who value low noise under load. Builders needing more than 850 W or requiring multiple 12V-2x6 cables for multi-GPU setups should look at higher-wattage or larger models. Systems restricted to ATX 3.0-only motherboards will not gain the newer standard’s benefits.

125 mm depth decides fit

The 125 mm length is the single specification that determines whether this PSU fits your case. Measure the available clearance from the motherboard tray to the side panel or drive cage before ordering. If the space is shorter, this unit cannot be installed regardless of its other features.

How it compares

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

Price $101.99
Cheaper than about 67% 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 nameSuper Flower
Product colorBlack
Product typeATX3.1/ ATX3.0 Compatible
Graphics
SLI supportReady
Power
Max wattage850 W
Modular cablingFull Modular
Power factor correctionActive
Main power connector20+4Pin
12V railsSingle
Efficiency certificationCybenetics Platinum
Supply voltage100–240 V
AC input frequency50/60 Hz
Overvoltage protectionYes
Under voltage protectionYes
Over current protectionYes
Over power protectionYes
Size & build
Top fans size120 mm
Compatibility
Haswell compatibilityReady
PSU length limit125 mm
Environment & compliance
Over temperature protectionYes
More details
Fan configuration1 × 120 mm
Over load protectionYes
Short circuit protectionYes

Other versions of this model

4 more in the same range

Questions about this item

Will the 125 mm length fit my ATX case?

At 125 mm long this is the smallest ATX 850 W Platinum unit available, so it fits any standard ATX chassis that accepts a 125 mm deep power supply.

How do I connect the native 12V-2x6 cable for a PCIe 5.1 graphics card?

Plug the supplied 12V-2x6 cable directly into the PSU’s dedicated port and into the GPU — the common error is using an adapter instead of the native cable.

Does the 120 mm fluid-dynamic-bearing fan need periodic cleaning?

Yes, dust the 120 mm fan intake every few months to keep airflow optimal; the fluid dynamic bearing is sealed and requires no lubrication.

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