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Refurbished Dell MH596 280 W ATX power supply unit

DELL

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

SKU CH-NH1M-6KTJK MPN MH596

A 280 W ATX power supply for Dell Optiplex 330, 740, 745, 755 and Dimension C521 desktops

  • TypeATX
  • Maximum Power280 W
  • FeaturesGenuine Dell Power Supply - 280w For Small Desktop Cases, no
  • Weight1
  • 280 W output powers compatible Dell desktops
  • ATX form factor fits small chassis designs
  • Genuine Dell unit ensures correct pinouts
  • Supports OptiPlex 210L 320 330 360 740 745 755 GX520 GX620
  • Fits Dimension C521 and 3100C systems

Genuine Dell 280 W ATX unit

This refurbished Dell MH596 power supply delivers 280 W through a standard ATX form factor. It is built for small desktop cases rather than small-form-factor or tower chassis. The unit targets owners of Optiplex 330, 740, 745, 755, GX520 or GX620 desktops plus Dimension C521 and 3100C systems. Buyers needing higher wattage for discrete graphics or workstation-class CPUs should look elsewhere.

Fits legacy small-desktop builds

The supply slots directly into the listed Optiplex and Dimension models without adapter cables or bracket changes. Its ATX connector layout matches the motherboards used in those 210, 320, 360 and 520 series systems. Using it frees the builder from hunting proprietary pin-outs or modified harnesses. Installers working with full-size tower cases or modern mainstream boards will find the connector set and physical depth unsuitable.

Steady output for vintage workloads

Under continuous load the 280 W rating is maintained within the thermal limits of the original small-desktop enclosures. The design lacks modern protection circuits such as over-current shutdown on individual rails, so sustained draws near the maximum should be avoided. Fan noise remains consistent with the original acoustic profile of the GX280-era platforms. Systems upgraded with power-hungry expansion cards may experience instability during prolonged sessions.

Highlights

  • 280 W output powers compatible Dell desktops
  • ATX form factor fits small chassis designs
  • Genuine Dell unit ensures correct pinouts
  • Supports OptiPlex 210L 320 330 360 740 745 755 GX520 GX620
  • Fits Dimension C521 and 3100C systems

Specifications

BrandDELL
ModelMH596
TypeATX
Maximum Power280 W
FeaturesGenuine Dell Power Supply - 280w
For Small Desktop Cases, not SFF or Tower
For Optiplex 210L, 320, 330, 360, 740, 745, 755 GX520, GX620 Systems Desktop Systems
For Dimension C521 and 3100C Systems
For New Style GX280 System
Weight1
Shipping weight1.81 kg
Package size432 × 305 × 102 mm

Questions about this item

What is the maximum continuous power output this 280 W unit can sustain for a Dell OptiPlex 755?

The power supply is rated at 280 W maximum output for the listed OptiPlex and Dimension desktops.

How loud is the fan and what heat should I expect when this PSU runs all day in a small desktop case?

The unit uses a standard ATX cooling fan; noise and temperature will vary with the system load inside your specific chassis.

Which power cables must my motherboard already have to connect this MH596 supply?

It provides the standard ATX main connector and peripheral leads required by OptiPlex 330, 740, 745, 755 and Dimension C521 boards.

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