Dell 250W Active PFC desktop-netadapter 77GHN (Delta)

When a desktop PC refuses to power on or shuts down under load, the original power supply has often reached the end of its life. The Dell 77GHN is a 250W active PFC power supply built by Delta Electronics for Dell OptiPlex 3010, 7010, 9010, 390, 790, and 990 desktop and small form factor systems. It restores stable, efficient power delivery without the need to replace the entire computer.

Who is it for

IT technicians, system integrators, and businesses maintaining fleets of Dell OptiPlex desktops. It is also suitable for home users who want a direct, reliable replacement for a failed or noisy power supply in a compatible Dell system.

Main features

• 250W total output with active power factor correction for efficient AC-to-DC conversion.
• Proprietary Dell form factor designed for OptiPlex 3010, 7010, 9010, 390, 790, and 990 desktop/SFF chassis.
• Single 24-pin main power connector and one 4-pin CPU power connector for reliable motherboard power.
• Three SATA power connectors and one peripheral (Molex) connector for drives and legacy devices.
• Single fan cooling with over voltage, over current, and short circuit protection.
• Manufactured by Delta Electronics, a trusted OEM supplier for Dell.

Specifications

• Power output: 250W
• Form factor: Proprietary Desktop (DT) / Small Form Factor (SFF)
• Input voltage: 100-240V AC
• Input frequency: 50/60 Hz
• Power factor correction: Active PFC
• Efficiency rating: 80 PLUS Bronze
• Main power connector: 1x 24-pin ATX (proprietary Dell)
• CPU power connector: 1x 4-pin ATX 12V
• SATA power connectors: 3
• Peripheral (Molex) connectors: 1
• Dell part number: 77GHN
• Compatible systems: OptiPlex 3010, 7010, 9010, 390, 790, 990 Desktop/SFF
• OEM manufacturer: Delta Electronics
• Cooling: Single fan
• Protection: Over voltage, over current, short circuit

Tips

Before ordering, confirm that your Dell OptiPlex model is listed as compatible. The 77GHN is not a standard ATX power supply and will not fit non-Dell or incompatible Dell chassis. Always disconnect the power cord and press the power button to discharge residual energy before installation.