FlexGURU 250W (New Edition)

FSP's FlexGURU Flex ATX models are available in standard direct output and modular cable configurations, which includes the most updated modular model selections in the market. The modular design improves the ease of installation, users can configure their connector cables according to the system needs. The special plug-in design for cables and jacks improves the convenience of replacement. Fully modular connectors allow users to quickly disassemble cables, pinpoint issues, and save debugging time whenever the system experiences problems.
  • Compliant with the latest Flex ATX V1.22
  • 300W : Efficiency ≥ 90% at typical load
  • 250W : Efficiency ≥ 85% at typical load
  • Compliant with the latest UL/EN/IEC 62368
  • Intelligent fan speed control
  • Quiet and long-lasting 40mm ball bearing fan
  • Includes power cable
  • Includes 20+4 pin, 4+4 pin, Molex and SATA cables
  • Ribbon cable design for DIY enthusiasts
  • Powerful single +12V rail design
  • Main Japanese electrolytic capacitors
  • Intel latest CPU ready
  • Complete protections: UVP, OVP, SCP, OPP, OTP

Fully Modular Design

A fully modular design with all black ribbon cables simplifies installation and allows you to use only the cables you need for a cleaner build.

High Power Density

The FlexGURU series features higher power density, 20% higher than any Flex PSU in the same category.

Firm Installation with Beetle Technology

FSP pioneered the development of the Beetle technology in its Flex ATX PSU. The new Beetle technology strengthens the fixation adequacy by 25%, which allows the PSU to fit into most Flex ATX chassis available on the market today.

Excellent Thermal Performance

The FlexGURU series differs from the general Flex PSU by offering a built-in inner 40mm fan. This reduces noise and offers maximum cooling at all times.

85% Efficiency Conversion

The efficiency of your power supply is important because it directly affects your system's performance. The FlexGURU 250W has a guaranteed typical efficiency of 85%, which offers high conversion power to boost your system.

Application Field

Industrial PC

  • Industrial PC

  • Point of Sale System

  • Network communication

  • Surveillance

  • Edge Computer

  • Home Theater Personal Computer

  • NAS Server

  • Gaming & Creator PC

Keep in Compliance IEC 62368

FSP Group brings you the latest technologies in renewable energy. FSP provides a full range of additional safety features to keep up with the latest regulations. FSP has upgraded the majority of their power supplies to the latest UL 62368 standard.

Safety Protection

OVP (Over Voltage Protection), UVP (Under Voltage Protection), OPP (Over Power Protection), SCP (Short Circuit Protection), and OTP (Over Temperature Protection), a full guardian circuit protections to keep your hardware safe.

100% Japanese Electrolytic Capacitors

Using Japanese electrolytic capacitors, the FlexGURU series offers stable output and the long-term reliability that you need.




AC Input100-240Vac~  4-2A  50-60Hz
DC Output+3.3V+5V+12V-12V+5Vsb
Max Output Current12A14A18A0.3A2.5A
Max Combined Power80W MAX 
Total Power250W


 atx cable 24 pinEPS 4 4 pinhd statmolex
ATX 20+44+4 PINSATAMolex
*Cable #111  
*Cable #2  21
*Cable #3  3 
*There are 3 sets of cables available for different cable combinations.
(ie. Cable #1 & #2 or Cable #1 & #3)


Model FSP250-50FGBBI(M)
Rated Output Power 250W
Form Factor Flex ATX
Input Voltage 100-240V
Input Current 4-2A
Input Frequency 50-60Hz
PFC Active PFC
Efficiency 85%
Fan Type Ball Bearing, 40mm
Dimensions(L x W x H) 150 x 40.5 x 81.5mm
Operation Temp. 100,000 Hrs
Protection UVP, OVP, SCP, OPP, OTP
2022 By FSP GROUP All rights reseved.
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