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Silver metal ATX power supply unit with cooling fan and cable bundle

DELL

DELL NPS-250KB 250W power supply

SKU CH-QFWC-64EXS MPN NPS-250KB

250 W ATX power supply with 20-pin and 4-pin CPU connectors for Dell OptiPlex GX260, Dimension 2400 and 3000 systems

  • Main power connectorP1–20pin ATX Motherboard Power P2–4pin Pentium 4 Motherboard
  • Rated input current100-120 V~/ 9.0A 50-60 Hz
  • Output type250 W
  • Product typeATX
  • Genuine Dell replacement for OptiPlex GX260 and Dimension 4550 systems
  • 250 W maximum output powers legacy desktop components reliably
  • ATX form factor fits standard chassis mounting points
  • 100-120 V input at 9.0 A suits North American mains supply
  • Multiple connectors include 20-pin ATX, 4-pin CPU and peripheral Molex leads

Genuine Dell 250W ATX power supply

This genuine Dell NPS-250KB unit delivers 250W through a 20-pin ATX main connector, a 4-pin Pentium 4 connector, multiple 4-pin Molex outputs, a 6-pin connector and a floppy power lead. It accepts 100-120V AC input at 9.0A across 50-60Hz and fits the standard ATX form factor.

Suits owners of listed Dell desktops needing

It matches the K2583 part for OptiPlex GX260, Dimension 4550, 8200, 2400 and 3000 systems. Builders working on non-Dell chassis, boards requiring a 24-pin ATX connector or modern CPU power layouts, or anyone needing more than 250W should look elsewhere.

The 20-pin ATX main connector decides fitment

Many later motherboards expect a 24-pin socket; this supply provides only the original 20-pin layout plus a dedicated 4-pin Pentium 4 plug. Verify the motherboard power header before ordering.

How it compares

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

Price $49.99
Cheaper than about 91% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Brand nameDell
Model nameNPS-250 KB F
Product typeATX
Ports & slots
Output type250 W
Power
Rated input current100-120 V~/ 9.0A 50-60 Hz

Questions about this item

What motherboard power connectors must my board provide for the 20-pin ATX and 4-pin Pentium 4 plugs on this unit?

Your motherboard needs a 20-pin ATX main power socket and a separate 4-pin Pentium 4 auxiliary power socket to match the P1 and P2 connectors on this supply.

Will the 250 W output and 100-120 V input range support a Dell OptiPlex GX260 or Dimension 3000 that I already own?

Yes, this unit is listed as compatible with the OptiPlex GX260 and Dimension 3000, delivering 250 W from a 100-120 V 9.0 A input.

How can I confirm the supply is operating correctly once installed in a Dimension 4550 or OptiPlex GX270?

The system should power on reliably, all drives and fans should spin, and the operating system should load without unexpected shutdowns.

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