darkFlash PMT850 Fully Modular ATX 3.1 PCIe 5.1 Ready - Compact 150mm

In this review the darkFlash PMT850 proves itself as a compact, practical power supply aimed at gamers and power users who need a modern, reliable ATX 3.1 unit without a huge footprint. The biggest reason to consider it is its combination of native PCIe 5.1 12VHPWR support and an 850 W, 80 PLUS Gold design delivered in a 150mm chassis, which makes it an attractive choice for builders who want high GPU headroom and tidy cable management in smaller cases.

Key Features

• ATX 3.1 Compatibility: Supports up to 200% total power excursion and 300% GPU power excursion for added stability with modern CPU and GPU power spikes.
• 80 PLUS Gold Efficiency: Reaches around 90% efficiency under typical loads, lowering wasted energy and helping reduce long-term running costs.
• 105C Japanese Capacitors: Uses high-grade all-Japanese 105C capacitors for improved durability and stable operation under sustained load.
• Native 12VHPWR Cable: Includes a 12V-2x6 native 12VHPWR cable capable of delivering up to 600 W to compatible PCIe 5.1 graphics cards.
• Fully Modular Design: Allows connecting only required cables, simplifying cable routing and improving case airflow for cooler operation.
• Compact 150mm Size: Small form factor fits tighter builds while still delivering full-featured power for high-end components.

Who It's For

The PMT850 is ideal for PC builders who want modern power delivery in a compact package: gamers upgrading to an RTX 30/40 series or comparable AMD GPU that benefits from a native 12VHPWR connector, and system builders who need ATX 3.1 headroom for transient loads. Its fully modular cables and compact depth make it a good fit for mid-tower and compact cases where cable management matters.

It may be less compelling for users who do not need PCIe 5.1 support or who prioritize a quieter or larger-capacity unit; some customer reports mention mixed noise experiences, so those extremely sensitive to fan noise or seeking ultra-silent operation should audition it in their chassis or consider alternatives focused specifically on noise performance.

Pros & Cons

Pros

• Modern ATX 3.1 and PCIe 5.1 readiness with generous power excursion tolerances for stable peak demands.
• High efficiency from 80 PLUS Gold design reduces waste and operating cost.
• Durable 105C Japanese capacitors improve long-term reliability under load.
• Fully modular cables and included native 12VHPWR make builds cleaner and compatible with recent GPUs.

Cons

• Noise reports are mixed among users, so acoustic behavior can vary by system and case airflow.
• 850 W is ample for most builds but those planning extreme multi-GPU or heavy overclocking may prefer a higher wattage model.

Specifications

Wattage	850 W
Form Factor	ATX 3.1, 150mm compact depth
Efficiency	80 PLUS Gold (up to ~90%)
Capacitors	100% Japanese 105C capacitors
PCIe Connector	Native 12VHPWR (12V-2x6) included, up to 600 W
Design	Fully modular cables
Warranty	5 year warranty

Our Verdict

The darkFlash PMT850 is a well-balanced choice for builders who need PCIe 5.1 compatibility and ATX 3.1 transient handling in a compact 150mm housing. It pairs modern power delivery, all-Japanese capacitors, and modular cabling at a price that represents good value for contemporary gaming and content-creation systems, though buyers sensitive to fan noise should verify acoustic performance in their case.

Frequently Asked Questions

Does it include a 12VHPWR cable?
Yes, a native 12V-2x6 12VHPWR cable is included to support PCIe 5.1 graphics cards up to the specified power limit.

Is this power supply fully modular?
Yes, the PMT850 uses a fully modular cable design so you only connect the cables you need for cleaner builds and better airflow.

Will it run an RTX 30 or 40 series card?
Yes, it is compatible with Nvidia RTX 30/40 series and comparable AMD GPUs, with 12V synchronous rectification and DC-DC support for stable GPU delivery.