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Black rectangular Flex ATX power supply with 140 mm fan and modular cable sockets

FSP

FSP FlexGURU 300W Flex ATX power supply

SKU CH-QGY4-WZFXJ

A fully modular Flex-ATX power supply delivering 300W with 80 PLUS Gold efficiency and Japanese capacitors for compact IPC, NAS and HTPC builds

  • Max wattage300 W
  • Power efficiency> 90%
  • Modular cablingFull Modular
  • Fan configuration1 × 140 mm
  • Power factor correctionActive
  • Main power connector20+4Pin

Wattage 300W

  • 80 PLUS Gold certification delivers up to 90% efficiency reducing heat and energy use
  • Full modular all-black ribbon cables simplify installation and improve internal airflow
  • Universal mounting bracket with auxiliary brackets fits most Flex-ATX chassis and industrial setups
  • Japanese electrolytic capacitors ensure precise voltage regulation and long-term reliability
  • Industrial safety protections UVP OVP SCP OPP OTP secure critical components in demanding environments

Compact Flex-ATX power supply

The FSP FlexGURU is a 300 W Flex-ATX unit built for small-form-factor PCs, industrial systems and NAS enclosures. Its fully modular ribbon cables and universal mounting bracket simplify integration in tight chassis while keeping airflow clear. 80 PLUS Gold certification and Japanese main capacitors deliver efficient, stable power for continuous workloads.

Suited for space-constrained builds

This supply fits builders who need a high-efficiency, fully modular Flex-ATX unit with a single +12 V rail and industrial-grade protections. It is not for systems that require multiple SATA power connectors or higher total wattage than 300 W.

Single +12 V rail at 300 W

The unit provides one +12 V rail rated for the full 300 W maximum output. This specification determines whether the supply can meet the peak current demands of your components in a compact or industrial chassis.

How it compares

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

Price $110.99
Cheaper than about 63% of the 10,869 comparable items (median $142.99).
Max wattage 300 W
Lower than about 92% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameFSP Group
Model nameFlex Guru
Part numberPPA3004302
Product colorBlack
Product typeATX
Ports & slots
SATA power connectors1
Power
Max wattage300 W
Power efficiency> 90%
Modular cablingFull Modular
Power factor correctionActive
Main power connector20+4Pin
12V railsYes
Efficiency certification80 PLUS GOLD Certified
Overload protectionYes
More details
Fan configuration1 × 140 mm

Other versions of this model

2 more in the same range

Questions about this item

What mounting hardware is included with the FlexGURU 300W Flex ATX unit?

The package includes a universal mounting bracket, auxiliary brackets and a special mounting hole design that fits most Flex-ATX chassis and IPC enclosures.

How do I connect the modular cables and which step is often missed?

Plug only the required all-black ribbon cables into the PSU side first, then route them to components; the step often missed is seating each connector fully until it clicks.

When should the 140 mm cooling fan be cleaned or replaced?

Clean the fan intake with compressed air every 12 months or when dust buildup is visible; replace the fan if bearing noise appears or airflow drops noticeably.

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