Dell NPS-300GB power supply replacements.
The following product(s) are recommended for Dell NPS-300GB. All items in the list are compatible replacements for Dell NPS-300GB power supplies:
The FSP400-60PFB-M is most famous for its use as a Dell Dimension 8100 power supply replacement/upgrade. The fact that this 400 watt power supply is equipped with a rare 16 pin power supply connector makes it able to operate computer systems that other power supplies cannot. Expect compatibility, reliability and long life out of this top-shelf FSP product. Note: It may be necessary to add the "24 to 20 pin atx adapter". This is offered right below the picture of the power supply and right above the "buy now" button.

Disclaimer: This power supply cross reference chart is for informational purposes and reflects only the opinion of the author. The sole responsibility rests with the buyer when selecting a power supply for a computer. This power supply cross reference is simply here to offer help and suggestions based on previous experience, and though extremely accurate, offers no guarantees.