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

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.