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Silver rectangular metal power supply unit with rear fan grille and label stickers

DELL

DELL D275P-00 275 W power supply for Optiplex 740 745 755 SFF

SKU CH-MZG5-HJZNN MPN D275P-00

A 275 W power supply for Dell Optiplex 740, 745 and 755 small-form-factor desktops, accepting 100 to 240 V input at 47 to 63 Hz

  • Max wattage275 W
  • Fan configuration1
  • Supply voltage100–240 V
  • AC input frequency47–63 Hz
  • Output type275 W
  • Product typeRedundant Power Supply
  • Delivers 275 W to keep Optiplex SFF systems stable
  • Single fan provides cooling for continuous operation
  • Wide 100-240 V input works on global mains
  • 47-63 Hz frequency range matches standard power grids
  • Direct fit for Optiplex 740 745 755 small form factor

Direct replacement for Optiplex SFF

The Dell D275P-00 is a 275 W power supply built for Optiplex 740, 745 and 755 small-form-factor desktops. It matches the original part numbers PW124, 0PW124 and CN-0PW124. The unit accepts 100 to 240 V input at 47 to 63 Hz, making it suitable for worldwide mains voltage. Buyers restoring or maintaining these specific SFF systems will find the correct fit.

Single-fan ATX-style chassis with proprietary pinout

A single fan cools the supply inside a metal enclosure that follows the Optiplex SFF mounting pattern. The connector layout is proprietary to the 740, 745 and 755 chassis, so the unit plugs directly into the motherboard without adapters. No redundant-module cage is present despite the supplier labelling it as a redundant type; it functions as a standard single supply. Builders needing a standard ATX pinout or a different form factor cannot use this part.

275 W maximum output defines the power budget

The supply delivers up to 275 W total across its rails, setting the limit for CPU, graphics and peripheral upgrades. The 3 A input rating at 100 to 240 V reflects the peak draw from the wall. Systems requiring more than 275 W or a different connector layout will need a different power solution.

How it compares

Measured against everything we stock in ATX Desktop Power Supplies, at today’s prices. Recalculated every night.

Price $56.99
Cheaper than about 87% of the 10,869 comparable items (median $142.99).
Max wattage 275 W
Lower than about 93% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameDell
Product lineDell Optiplex 740 745 755
Model nameD275P-00
Product typeRedundant Power Supply
Ports & slots
Output type275 W
Power
Max wattage275 W
Supply voltage100–240 V
AC input frequency47–63 Hz
More details
Fan configuration1

Questions about this item

What input voltage range does the D275P-00 accept and what maximum output does that allow?

The unit accepts 100 to 240 V at 47 to 63 Hz and delivers up to 275 W.

Which Dell OptiPlex SFF chassis does the D275P-00 fit?

It is built for the OptiPlex 740, 745 and 755 small form factor cases.

How do I install the D275P-00 and what step is often missed?

Slide the supply into the SFF bay until the latch clicks, then connect the main board and CPU power cables; the latch click is the step people skip.

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