does this fit the mini desktop? 0ptiplex 740

Yes, as long as your "mini desktop" meets these dimensions: 16 x 5 x 14 inches. Dell refers to these PCs as "Mini Towers (MT)" or "small form factor (SFF)". Physical fit is one thing, but make sure the wattage is correct, too. Check the label on the old p/s to make sure it matches the 280 Watts rating of the NH429 H280P-01. I put the ones I ordered into a couple of OptiPlex 755 SFFs.

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Dell NH429 ATX12V Power Supply

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General InformationManufacturer: Dell TechnologiesManufacturer Part Number: NH429Manufacturer Website Address: http://www.delltechnologies.comBrand Name: DellProduct Name: ATX12V Power SupplyProduct Type: Power SupplyTechnical InformationNumber of Fans: 1Power DescriptionInput Voltage: 110 V AC220 V ACNumber of +12V Rails: 1Output Voltage: 3.3 V DC @ 10 A5 V DC @ 15 A12 V DC @ 16 A-12 V DC @ 500 mA5 V DC @ 4 AOutput Power: 280 WPhysical CharacteristicsForm Factor: InternalHeight: 4"Width: 5"Depth: 5.3"MiscellaneousCompatibility: Dell Dimension C521 Desktop PCDell OptiPlex Desktop PCs:330740745755Environmentally Friendly: YesEnvironmental Certification: RoHS

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General InformationManufacturer: Dell TechnologiesManufacturer
Part Number: NH429Manufacturer
Website Address:
http: //www. delltechnologies.
comBrand Name: DellProduct
Name: ATX12V
Power SupplyProduct Type: Power SupplyTechnical InformationNumber of
Fans: 1Power
DescriptionInput Voltage: 110 V AC220 V ACNumber of +12V
Rails: 1Output
Voltage: 3.3 V DC @ 10 A5 V DC @ 15 A12 V DC @ 16 A-12 V DC @ 500 mA5 V DC @ 4
AOutput Power: 280
WPhysical CharacteristicsForm Factor:
InternalHeight:
4"Width:
5"Depth: 5.3"M
iscellaneousCompatibility: Dell Dimension C521 Desktop PCDell OptiPlex Desktop PCs: 330740745755Environmentally
Friendly: YesEnvironmental
Certification: RoHS

General
Brand	DELL

Details
Type	Power Supply

Additional Information
First Listed on Newegg	November 14, 2016

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