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Dell 3WFNF 250W 24-pin SFF desktop power supply unit

DELL

DELL 3WFNF 250 W 24-Pin Desktop Power Supply for Inspiron 540S/545S and OptiPlex 990 SFF

SKU CH-CPAZ-M1D88

A 250 W 24-pin desktop power supply compatible with Inspiron 540S, 545S and OptiPlex 990 SFF systems

  • Max wattage250 W
  • Modular cablingNo
  • Fan configuration1 Fan
  • Product typeDesktop Power Supply
  • Product weight5
  • 250 W output powers Inspiron 540S and 545S desktops
  • 24-pin connector fits OptiPlex 990 SFF systems
  • Single fan cools the unit during operation
  • Fixed cable set simplifies installation
  • New condition ensures reliable performance out of the box

Compatible Desktop Power Supply

This 250 W unit is built for Dell Inspiron 540S, 545S and OptiPlex 990 SFF desktops. It uses a standard 24-pin connector to deliver power to the motherboard and internal drives. The non-modular design keeps all cables permanently attached for a direct fit.

Who This Suits

It suits owners of the listed Dell models who need a direct replacement for a failed or noisy original unit. Builders working with proprietary Dell SFF chassis or non-standard pinouts should look elsewhere. Systems requiring higher wattage for discrete graphics cards or heavy upgrades are not supported by this 250 W limit.

250 W Maximum Power Rating

The 250 W ceiling is the single figure that decides compatibility with your component list. Check the combined draw of your CPU, drives and any add-in cards against this limit before purchasing. Exceeding it will cause instability or prevent the system from starting.

How it compares

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

Price $36.99
Cheaper than about 93% of the 10,869 comparable items (median $142.99).
Max wattage 250 W
Lower than about 94% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameDELL
Product typeDesktop Power Supply
Power
Max wattage250 W
Modular cablingNo
More details
Fan configuration1 Fan

Questions about this item

Will the 24-pin connector fit my Inspiron 540S or 545S chassis?

The 24-pin ATX connector matches the motherboard socket used in Inspiron 540S and 545S desktops, and the unit is built for the SFF form factor those models use.

How do I install the 250 W unit in an OptiPlex 990 SFF, and what step is often missed?

Slide the supply into the SFF bay, secure the two chassis screws, then plug the 24-pin cable fully into the motherboard; the step often missed is latching the connector clip until it clicks.

When will the single internal fan need cleaning or replacement?

Expect to clean dust from the fan intake every six to twelve months; if bearing noise appears or airflow drops, replace the entire 250 W supply as the fan is not user-serviceable.

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