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Compact silver 1U Flex PSU with 40 mm fan and modular cable sockets

Seasonic

Seasonic SSP-300SUG 300 W Flex 1U power supply

SKU CH-PXJE-C2SNJ MPN SSP-300SUG

A 300 W Flex 1U ATX12V supply with full modular cables, 80 PLUS Gold efficiency and a 40 mm double ball-bearing fan for compact chassis

  • TypeATX12V
  • Maximum Power300 W
  • Fans40 mm Double ball Bearing fan
  • PFCActive
  • Main Connector24Pin
  • +12V RailsSingle
  • 80 PLUS Gold certification delivers 87 percent efficiency at typical loads
  • Full modular cabling lets you connect only the wires your build needs
  • Single +12 V rail rated at 25 A provides stable power for modern CPUs
  • 40 mm double ball-bearing fan runs quietly across the 0-50 °C operating range
  • MTBF exceeding 100000 hours signals long-term reliability for continuous operation

Compact 1U Power Supply

The Seasonic SSP-300SUG is a 300 W Flex ATX unit built for 1U rackmount chassis and small-form-factor workstations. It delivers a single +12 V rail rated at 25 A and carries 80 PLUS Gold certification at 87 % typical efficiency. Active PFC and DC-to-DC conversion keep voltage regulation tight across the 100-240 V input range.

Full Modular Build Quality

All cables detach from the housing so only the 24-pin, 4+4-pin, three SATA, one 4-pin Molex and one FDD leads you need stay inside the case. Japanese capacitors and a 40 mm double ball-bearing fan support an operating window of 0-50 °C and an MTBF beyond 100,000 hours. The 150 mm depth fits standard Flex bays without blocking adjacent slots.

Single +12 V Rail at 25 A

The entire 300 W budget sits on one +12 V rail, simplifying GPU or CPU power planning in dense builds. Over-voltage, over-power and short-circuit protection cover every output, while the 5 VSB line supplies 2 A for modern standby states. Haswell readiness confirms compatibility with low-power C-states.

Highlights

  • 80 PLUS Gold certification delivers 87 percent efficiency at typical loads
  • Full modular cabling lets you connect only the wires your build needs
  • Single +12 V rail rated at 25 A provides stable power for modern CPUs
  • 40 mm double ball-bearing fan runs quietly across the 0-50 °C operating range
  • MTBF exceeding 100000 hours signals long-term reliability for continuous operation

Specifications

BrandSeaSonic
ModelSSP-300SUG
TypeATX12V
Maximum Power300 W
Fans40 mm Double ball Bearing fan
PFCActive
Main Connector24Pin
+12V RailsSingle
SATA Power Connector3
Haswell SupportReady
Max PSU Length150 mm
ModularFull Modular
Efficiency87%
Energy-Efficient80 PLUS GOLD Certified
Over Voltage ProtectionYes
Input Voltage100 - 240 V
Input Frequency Range50/60 Hz
Output+3.3V@10A, +5V@14A, +12V@25A, [email protected] , +5VSB@2A
MTBF>100,000 Hours
Connectors1 x Main Power (24P)
1 x ATX12V (4+4P)
3 x Peripherals: SATA
1 x 4P mole
1 x FDD
Features80 PLUS GOLD Certificate
Serial ATA ready
DC to DC converter design
High efficiency and reliability
Low ripple & noise
Super low noise fan control
Short circuit protection on all outputs
Over voltage protection & Over power protection
100% hi-pot test
100% burn in, high temperature cycled on/off
Dimensions1.59" x 3.21" x 5.91"
Shipping weight0.92 kg
Package size159 × 102 × 3 mm

Questions about this item

Will this 300 W unit fit my 1U rackmount chassis?

The power supply is a Flex 1U form factor with a maximum length of 150 mm, matching standard 1U server and slim desktop cases.

What CPU power connector does it include for modern motherboards?

It provides a 4+4-pin ATX12V cable that splits to serve both 4-pin and 8-pin CPU sockets.

How many SATA drives can I power directly from the modular cables?

Three SATA power connectors are supplied, so you can attach up to three SATA SSDs or hard drives without adapters.

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