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Silver rectangular Micro ATX power supply unit with cooling fan visible

DELL

DELL OptiPlex 3020 7020 9020 255W power supply YH9D7

SKU CH-0291-AGS16

A 255 watt desktop power supply compatible with OptiPlex 3020, 7020 and 9020 systems

  • Colorsilver
  • TypeMicro ATX
  • 255 W output powers OptiPlex 3020 7020 9020 builds
  • Modular cabling reduces clutter inside small-form-factor cases
  • Direct replacement matches part numbers YH9D7 NT1XP FP16X 3XRJO T4GWM
  • Single fan cooling keeps thermals steady under load
  • 8-pin plus 4-pin connectors feed CPU and motherboard reliably

What this power supply fits

This 255W Dell unit is built for OptiPlex 3020, 7020 and 9020 small-form-factor desktops. It uses a micro-ATX footprint and a single cooling fan, delivering up to 255 watts through an 8-pin plus 4-pin connector set. The silver chassis matches the original case aesthetics and is marked with part number YH9D7.

Who should buy it and who should not

It suits owners of the listed OptiPlex models who need a direct replacement for a failed or noisy original supply. Builders working in standard ATX cases, or anyone requiring higher wattage for discrete graphics cards, should look elsewhere because the form factor and connector layout are specific to these Dell SFF systems.

Installation notes and common issues

The modular design lets you attach only the cables required, which simplifies routing inside the tight SFF chassis. Alignment of the 8-pin and 4-pin plugs is straightforward, but the proprietary mounting tabs mean the unit will not fit non-Dell cases without modification. Verify the part number against your service tag before ordering.

Highlights

  • 255 W output powers OptiPlex 3020 7020 9020 builds
  • Modular cabling reduces clutter inside small-form-factor cases
  • Direct replacement matches part numbers YH9D7 NT1XP FP16X 3XRJO T4GWM
  • Single fan cooling keeps thermals steady under load
  • 8-pin plus 4-pin connectors feed CPU and motherboard reliably

Specifications

BrandDELL
SeriesOptiplex 3020 7020 9020
ModelOptiplex 3020 7020 9020
Part NumberYH9D7
Colorsilver
TypeMicro ATX

Questions about this item

Does my OptiPlex 3020, 7020 or 9020 chassis accept this 255 W Micro ATX unit?

The supply is built for the OptiPlex 3020, 7020 and 9020 small-form-factor cases and uses the Micro ATX form factor those systems require.

Will the 8-pin plus 4-pin connector set power the motherboard and CPU in my existing OptiPlex?

Yes, the unit provides the combined 8-pin and 4-pin connectors that the OptiPlex 3020, 7020 and 9020 motherboards use for main and CPU power.

How can I confirm the fan and voltages are operating correctly once installed?

Listen for the single cooling fan spinning at boot and verify the system posts without unexpected shutdowns, which indicates the 255 W supply is delivering stable power.

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