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Compact silver Flex ATX power supply with 40mm fan and black cables

FSP

FSP FlexGURU Pro 500W Flex ATX power supply

SKU CH-CWS6-TH1ZE

Delivers 500 W through a Flex ATX form factor with 80 Plus Gold efficiency, a single +12 V rail, two PCIe connectors and four SATA connectors for compact builds

  • Max wattage500 W
  • Power efficiency> 90%
  • Modular cablingNon-Modular
  • Fan configuration1 × 40 mm
  • Power factor correctionActive
  • Main power connector20+4Pin

Wattage 500W

  • Up to 90 % efficiency with 80 Plus Gold certification
  • Single +12 V rail delivers stable power under heavy loads
  • 40 mm 2-ball bearing fan with intelligent speed control for thermal performance
  • Japanese electrolytic capacitors ensure long-term voltage regulation
  • Universal bracket fits Flex ATX chassis, SFF PCs, 1U IPCs and NAS units

Flex ATX 500W power supply

The FSP FlexGURU Pro delivers 500W of continuous power in the Flex ATX form factor, making it suitable for small form factor PCs, 1U industrial chassis and NAS enclosures. It carries 80 Plus Gold certification and uses a single +12V rail to supply stable voltage to demanding components. A universal mounting bracket is included for broad chassis compatibility. All cables are non-modular, all-black and rounded for easier routing in tight spaces.

Thermals noise and power draw

A 40mm double ball-bearing fan with intelligent speed control manages cooling while keeping acoustic output low during typical workloads. Gold-rated efficiency above 90% reduces waste heat and lowers energy draw from the wall. Active PFC and a 100-240V input range ensure clean power delivery across global mains supplies. Premium Japanese electrolytic capacitors support tight voltage regulation under sustained load.

Upgrade path and fit

This unit replaces older, lower-wattage Flex ATX supplies when a build requires more headroom for discrete graphics or additional drives. The two 6+2-pin PCIe connectors and four SATA power plugs support a modern GPU and multiple storage devices. Builders staying with non-modular cabling and the Flex ATX footprint will find a direct mechanical and electrical fit. Those needing fully modular cables or higher wattage should consider other form factors.

How it compares

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

Price $132.99
Typical for this category: the median of 10,869 items is $142.99.
Max wattage 500 W
Lower than about 84% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameFSP Group
Product lineFlex Guru Pro Series
Model nameFlex Guru
Part numberPPA5008404
Product typeFlex ATX
Ports & slots
PCIe power connectors2 × 6+2-Pin
SATA power connectors4
Power
Max wattage500 W
Power efficiency> 90%
Modular cablingNon-Modular
Power factor correctionActive
Main power connector20+4Pin
12V railsSingle
Efficiency certification80 PLUS GOLD Certified
Supply voltage100–240 V
AC input frequency60-50 Hz
Rated input current8-4A
More details
Fan configuration1 × 40 mm

Other versions of this model

2 more in the same range

Questions about this item

How is the Flex ATX unit with its universal bracket installed, and which step is often missed?

Mount the PSU in the chassis, attach the universal bracket to match the case screw pattern, then connect the fixed 20+4Pin, two 6+2-Pin PCIe and four SATA cables; the step often missed is securing the bracket before routing cables.

What maintenance or replacement will the 40 mm 2-ball bearing fan need later?

The 2-ball bearing fan is rated for long life; typical maintenance is occasional dust removal with compressed air, and replacement is only needed if bearing noise appears after years of continuous operation.

What limit appears first under sustained full load on the single +12V rail?

The 500W maximum power and 80 Plus Gold efficiency ceiling; at continuous 500W draw the unit reaches its thermal and current design limit before the single +12V rail regulation does.

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