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Rectangular metal internal power supply unit with ventilation grille and cable connectors

DELL

DELL MH596 280W power supply for OptiPlex 330 740 745 755 Dimension C521

SKU CH-X8R0-ADS27

280 W ATX12V internal power supply compatible with OptiPlex 330, 740, 745, 755 and Dimension C521 desktops

  • TypeOthers
  • 280 W output powers compatible Dell desktops reliably
  • 110 V and 220 V AC input suits global mains supplies
  • Genuine Dell MH596 unit fits OptiPlex 330, 740, 745, 755
  • Direct replacement for Dimension C521 and C521 3100C systems
  • Internal ATX12V form factor installs inside standard chassis

Compatible Dell Desktops

This internal ATX12V power supply delivers 280 W for Dell OptiPlex 330, 740, 745, 755, GX280, GX520, GX620, 210L, 320, 360 and Dimension C521 systems. It is a direct replacement for the original MH596 unit and operates on 110 V AC or 220 V AC mains input. Builders restoring or servicing these specific models can install it without adapter cables.

Thermals and Power Draw

The 280 W rated output handles the typical load of the supported OptiPlex and Dimension chassis under normal office workloads. Standard internal airflow passes through the unit to manage heat within the original case design. No auxiliary fan headers or liquid-cooling connections are present, so thermal performance depends entirely on the host system's ventilation.

Included Hardware

The package supplies only the power supply unit itself; no mounting screws, cable ties or configuration software are bundled. Installation relies on the existing screws and drive-bay brackets already fitted in the compatible Dell desktops. Users requiring additional cables or management accessories must source them separately.

Høydepunkter

  • 280 W output powers compatible Dell desktops reliably
  • 110 V and 220 V AC input suits global mains supplies
  • Genuine Dell MH596 unit fits OptiPlex 330, 740, 745, 755
  • Direct replacement for Dimension C521 and C521 3100C systems
  • Internal ATX12V form factor installs inside standard chassis

Spesifikasjoner

BrandDELL
TypeOthers

Spørsmål om denne varen

How do I install the MH596 power supply in an OptiPlex 755 and which step is often missed?

Remove the chassis side panel, unplug the old unit's 24-pin and 4-pin CPU cables, swap the supply, then reconnect both power cables; the 4-pin CPU connector near the socket is the step most often forgotten.

What maintenance or replacement will the MH596 need after extended use?

The internal fan bearings and electrolytic capacitors degrade over time; expect to replace the entire 280 W unit once fan noise rises or voltages drift under load.

What limit appears first when the MH596 runs continuously at full 280 W output?

Thermal protection triggers first; sustained 280 W loading raises internal temperature until the over-temperature circuit shuts the supply down to prevent damage.

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