Dell Power Supply, 255 Watts (W125718000)

When a Dell OptiPlex 3020 SFF, 7020 SFF, 9020 SFF, or Precision T1700 SFF workstation needs a reliable replacement power supply, this 255 W unit steps in to restore full functionality. It connects via an 8-pin Dell proprietary motherboard connector and a 4-pin CPU power connector, delivering stable power for everyday business tasks and light multitasking.

Key specifications

• Power output: 255 W
• Form factor: Small Form Factor (SFF)
• Input voltage: 100-240V AC
• Input frequency: 50/60 Hz
• Main motherboard connector: 8-pin Dell proprietary
• CPU power connector: 4-pin Dell proprietary
• SATA power connectors: 3
• Peripheral (Molex) power connectors: 1
• Efficiency rating: 80 PLUS Bronze
• Cooling: Active (single fan)
• +12V rail output: 18 A
• +5V rail output: 15 A
• +3.3V rail output: 15 A
• Protection: Over Voltage Protection (OVP), Over Current Protection (OCP), Short Circuit Protection (SCP)
• Alternative Dell part numbers: L255ES-00, H255ES-00, D255ES-00, AC255ES-00, 0W1257

Why choose it

This power supply is built for the specific power and connector requirements of Dell SFF systems. Its 80 PLUS Bronze efficiency reduces wasted energy and heat, while active cooling keeps temperatures in check during continuous operation. With three SATA connectors and one Molex, it supports a typical office storage configuration.

Ideal use cases

• Replacing a failed or failing PSU in a Dell OptiPlex 3020 SFF, 7020 SFF, or 9020 SFF
• Upgrading a Dell Precision T1700 SFF workstation with a reliable power source
• Maintaining a fleet of Dell SFF desktops in an office environment

Good to know

The unit operates on standard 100-240V AC input, making it suitable for use in various regions without a voltage switch. It is a direct replacement for Dell part numbers L255ES-00, H255ES-00, D255ES-00, AC255ES-00, and 0W1257.