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Rectangular metal power supply unit, matte grey finish, cooling vents on one side, power socket and fan grille on the rear

Thinkstar

Thinkstar H240As-00 240W power supply

SKU CH-84Z9-XW9P4 MPN H240As-00

Replacement 240W ATX power supply for Dell Optiplex 390, 790, 960, 990, 3010, 7010 and 9010 small-form-factor systems

  • Product typeATX
  • Direct replacement for Dell Optiplex SFF systems
  • 240W output powers compatible small form factor PCs
  • ATX form factor fits standard mounting points
  • Compact 9.9 x 3.6 x 4.4 dimensions suit tight chassis
  • Unit tested before shipment for reliable operation

Direct replacement for Dell Optiplex SFF

The Thinkstar H240As-00 is a new 240W ATX power supply built to fit Dell Optiplex 390, 790, 960, 990, 3010, 7010 and 9010 small form factor systems. It matches part numbers such as 3Wn11, 709Mt, 592Jg, 66Vfv and Dps-240Wb. It is not compatible with mini tower, desktop or ultra small form factor chassis.

Thermals and power delivery

Rated at 240W, the unit supplies the power envelope the listed Optiplex platforms expect. The compact 9.9 by 3.6 by 4.4 form factor uses the original mounting points and airflow path, so thermals and acoustic behaviour remain consistent with the factory design. No auxiliary power adapters are required.

Build quality and connectors

Each unit is tested before shipment to verify voltage stability and connector integrity. The native cable harness plugs directly into the motherboard and drive bays of the supported SFF models, eliminating adapter cables. Builders working on mini tower, desktop or ultra small form factor variants will need a different power supply.

How it compares

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

Price $45.99
Cheaper than about 91% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeATX

Questions about this item

How do I install the H240As-00 into my Dell OptiPlex SFF chassis and which step is often missed?

Slide the unit into the SFF bay until the latch clicks, secure the single retention screw, then connect the 24-pin motherboard and 4-pin CPU cables; the step most often missed is re-engaging the plastic latch after the screw is tight.

What maintenance or replacement will this 240W unit need over time?

The internal fan is the only moving part; expect to clean dust from the intake grille annually and replace the entire supply if fan noise increases or voltages drift after several years.

What limit appears first when the H240As-00 runs at full load continuously?

The 240W total output ceiling is reached before any connector-specific limit, so sustained draws near 240W will trigger overload protection first.

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