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Rectangular silver server PSU with fan grille and multiple cable connectors

DELL

DELL P192M 255W server power supply

SKU CH-3QSD-R4NZX

Genuine Dell 255 W unit with 24-pin ATX, four SATA and floppy power connectors for OptiPlex mini-tower systems

  • Product weight0.1
  • Genuine Dell 255W PSU fits Optiplex mini towers
  • 24-pin ATX plus 4-pin CPU power connectors included
  • Four SATA power connectors support multiple drives
  • Replaces Dell part numbers XK215 NH493 HK595 and more
  • Replaces model numbers NPS-305KB A N305P-01 and more

Genuine Dell 255W replacement PSU

This genuine Dell P192M power supply delivers 255W of continuous output for Optiplex 360, 380, 390, 580, 760, 780 and 960 mini-tower systems. It replaces a long list of Dell and third-party part numbers including P192M, XK215 and NPS-305KB A. The unit is new and weighs 0.1. It fits directly into the standard chassis without modification.

Sustained 255W delivery with ATX and SATA connectors

Under continuous load the supply maintains its rated 255W through a single 24-pin ATX connector, one 4-pin ATX power connector, four SATA power connectors and one floppy power connector. The fixed cable set powers the motherboard, processor and multiple SATA drives simultaneously without needing adapters. Stable rails keep the system running during extended work sessions.

Limited to legacy Optiplex mini-tower platforms

The connector layout and mechanical keying restrict use to the Optiplex models listed above. Builders needing PCIe power for discrete graphics, additional SATA ports beyond four, or a different form factor cannot use this unit. It does not support newer motherboard power standards or higher-wattage configurations.

How it compares

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

Price $66.99
Cheaper than about 81% of the 3,798 comparable items (median $131.99).

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Specifications

Product
Brand nameDELL
Model nameP192M

Questions about this item

How much power does the 255W Dell P192M draw from the wall when the OptiPlex 780 runs all day?

The unit delivers up to 255W to the system; actual wall draw depends on the components installed and will be higher than the DC output due to conversion losses.

Which cables must already be present in the OptiPlex 390 chassis for the P192M to connect?

The motherboard needs a 24-pin ATX socket and a 4-pin ATX power socket; drives need SATA power ports and the floppy connector requires a matching floppy drive header.

Will the P192M fit the same mounting points as the original NPS-305HB A supply in a Dell OptiPlex 760 mini-tower?

Yes, the P192M replaces the NPS-305HB A and other listed model numbers, so it uses the identical mini-tower mounting pattern and connector layout.

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