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

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.