Dell 255W Power Supply, 100V-240V (T4GWM)

The Dell 255W Power Supply (T4GWM) stands out as a compact Small Form Factor unit engineered specifically for Dell OptiPlex SFF desktops. Unlike generic ATX power supplies, its proprietary 8-pin main connector and tailored dimensions ensure a drop-in fit for OptiPlex 390, 790, 990, 3010, 7010, and 9010 series, eliminating the need for adapters or case modifications.

Highlights

• 255W continuous output with 80 PLUS Bronze efficiency
• Active cooling with a quiet fan
• Comprehensive protection: OVP, OCP, SCP
• Three SATA connectors for modern storage drives
• Wide input voltage range: 100-240V AC, 50/60Hz

In daily use

This power supply delivers stable, reliable power for office productivity and light multitasking. The 80 PLUS Bronze rating reduces energy waste and heat, while the fan adjusts speed based on load to keep noise low. With three SATA connectors, it supports a primary SSD, HDD, and optical drive in typical SFF configurations.

Full specifications

• Power Output: 255 W
• Input Voltage: 100-240 V AC
• Input Frequency: 50/60 Hz
• Form Factor: Small Form Factor (SFF)
• Efficiency Rating: 80 PLUS Bronze
• Main Power Connector: 8-pin ATX (Proprietary Dell)
• CPU Power Connector: 4-pin ATX
• SATA Power Connectors: 3
• Peripheral (Molex) Power Connectors: 0
• Floppy Power Connectors: 0
• Output Rail +12V: 18 A
• Output Rail +5V: 15 A
• Output Rail +3.3V: 15 A
• Output Rail -12V: 0.5 A
• Output Rail +5Vsb: 2 A
• Cooling Type: Active (Fan)
• Protection Features: OVP, OCP, SCP
• Compatibility: Dell OptiPlex 390, 790, 990, 3010, 7010, 9010 SFF Series
• Alternative Part Numbers: L255ES-00, H255ES-00, D255ES-00, AC255AS-00, F255ES-00

Final note

Designed for Dell SFF systems, the T4GWM is a reliable replacement or upgrade that meets original specifications without unnecessary bulk.