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Rectangular silver metal PSU with fan grille and cable bundle

DELL

DELL KH620 275 W ATX 12V power supply

SKU CH-NFAZ-KJJ9Y

Delivers 275 W ATX 12V power to compatible Dell OptiPlex and Dimension desktops with single 12 V rail

  • Max wattage275 W
  • 12V rails1
  • Supply voltage110 V AC 220 V AC
  • Product typeATX 12 V
  • 275 W maximum output powers compatible Dell desktops
  • Single +12 V rail delivers 17 A for stable CPU supply
  • Dual-range 110 V AC to 220 V AC input suits global mains
  • ATX12V form factor fits Optiplex 740 745 755 SFF chassis
  • Output rails include 3.3 V 5 A 5 V 18 A and -12 V 500 mA

Dell KH620 275 W ATX 12V power supply

This Dell KH620 is a 275 W ATX 12V internal power supply designed as a direct replacement for specific Dell desktop PCs. It delivers 12 V at 17 A and 5 V at 18 A through a single +12 V rail. The unit accepts 110 V AC or 220 V AC input.

Who this suits and who should look elsewhere

It suits owners of a Dell OptiPlex 740, 745, 755, GX520, GX620, Dimension 9200C or XPS 210 needing an exact 275 W replacement. Builders requiring higher wattage, multiple +12 V rails, or a standard ATX form factor for a non-Dell chassis should look elsewhere.

The deciding specification: proprietary Dell form

The physical dimensions are 8.3 in by 3.3 in by 2.5 in with a weight of approximately 3 lb. This proprietary Dell form factor fits only the listed OptiPlex, Dimension and XPS models. Verify your chassis matches this exact size before ordering.

How it compares

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

Price $99.99
Cheaper than about 67% of the 10,869 comparable items (median $142.99).
Max wattage 275 W
Lower than about 93% of the 930 comparable items (median 850 W).

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Specifications

Product
Brand nameDELL
Product typeATX 12 V
Power
Max wattage275 W
12V rails1
Supply voltage110 V AC 220 V AC

Questions about this item

Will the 8.3" × 3.3" × 2.5" internal form factor fit my OptiPlex 755 SFF chassis?

The supply is built to the Dell SFF layout used in the OptiPlex 740, 745 and 755, so the mounting holes and rear bracket line up with those cases.

Which cables must be connected during installation, and which one do builders often forget?

Attach the 24-pin ATX12V main connector and the 4-pin CPU power lead; the 4-pin CPU plug is the one most frequently left loose.

The single +12 V rail is rated at 17 A — when should I plan to replace the unit?

Expect to swap the PSU if the system becomes unstable under load, the fan grows noisy, or after roughly five years of daily use.

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