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Silver rectangular ATX power supply unit with single fan grille and power socket

DELL

DELL MM720 ATX Server Power Supply for Optiplex GX745 GX755

SKU CH-TD9K-3NEBY

ATX power supply with one fan and a single +12V rail, delivering 3.3 V, 5 V, 12 V and -12 V DC for Dell Optiplex GX745 and GX755 desktops

  • Product typePower Supply
  • Delivers stable power to Optiplex GX745 and GX755 desktops
  • Single 12 V rail simplifies component compatibility
  • Provides 3.3 V, 5 V, 12 V and -12 V DC outputs
  • One integrated fan maintains internal airflow
  • Weighs 2.98 lb for straightforward installation

Genuine Dell MM720 ATX power supply for Optiplex

This internal unit is built as a direct replacement for the original power supplies shipped with Dell Optiplex GX745 and GX755 desktop PCs. It provides the standard ATX output voltages of 3.3 V DC, 5 V DC, 12 V DC and -12 V DC across a single +12 V rail. The supply is intended for technicians or owners restoring or maintaining those specific Optiplex models.

Single-fan internal design

The unit uses a single cooling fan housed inside a conventional internal form factor. Its connector layout matches the ATX pin-out required by the GX745 and GX755 motherboards, so installation follows the original routing without adapter cables. Weighing approximately 2.98 lb, it fits the existing mounting points and chassis clearance of those desktops.

No extra cables or software included

The package contains only the power supply itself. No modular cables, mounting screws, diagnostic utilities or driver discs are bundled. Buyers who need additional connectors for add-in cards or peripheral upgrades will have to source suitable adapters separately. This unit does not support systems outside the listed Optiplex models.

How it compares

Measured against everything we stock in Server & Hot-Plug PSUs, at today’s prices. Recalculated every night.

Price $42.99
Cheaper than about 89% of the 3,798 comparable items (median $131.99).

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Specifications

Product
Brand nameDELL
Product typePower Supply

Questions about this item

What ATX standard does the MM720 follow, and what voltages does it deliver?

The unit is an ATX power supply providing 3.3 V DC, 5 V DC, 12 V DC and -12 V DC on a single +12 V rail.

What chassis and mounting points does the MM720 require?

It uses an internal ATX form factor weighing 2.98 lb and is built for Dell Optiplex GX745 and GX755 desktops.

How do I install the MM720, and which step is often missed?

Remove the old supply, slide the MM720 into the Optiplex bay, secure it with the chassis screws, then connect the main ATX and CPU power cables — the CPU connector is the one most often forgotten.

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