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New AT power supply unit, compact grey metal box, 300 W, 5.9 by 3.4 inches, Dell Optiplex GX520 GX620 compatible

myVolts

myVolts 300 W AT Power Supply for Dell Optiplex GX520 GX620

SKU CH-P697-1YT3P

Replaces legacy Dell Optiplex GX520 and GX620 units with a 300 W AT supply offering 115/230 V input, reduced depth, and SATA connectors

  • TypeAT
  • Delivers 300 W steady power for Dell Optiplex GX520 and GX620
  • Reduced 5.9" depth fits tight legacy cases
  • High-efficiency fan runs quietly with low ripple
  • Over-current and over-power protection safeguards components
  • 20+4-pin ATX, 4-pin ATX12V, three SATA, three peripheral, one floppy connectors

300 W AT PSU for OptiPlex GX520/GX620

This new AT-type power supply delivers 300 W of steady power and is built as a direct replacement for the Liteon PS-6351-2, ATX0350D5WA, K692G, ATX0300D5WB and DPS-350XB-2 A units found in Dell OptiPlex GX520 and GX620 desktops. It accepts 115 / 230 V input and includes over-current and over-power protection.

Reduced-depth design for legacy chassis upgrades

The unit measures 5.9" in height and 3.4" in width, offering a reduced depth that increases compatibility with tight legacy cases where standard ATX units would not fit. This physical profile makes the jump worthwhile when the original PSU has failed or when adding components that demand more reliable 12 V delivery than the aged original can provide.

Connector set for period-correct builds

It provides one 20+4-pin ATX motherboard connector, one 4-pin ATX12V connector, three peripheral connectors, one floppy drive connector and three SATA power connectors. This covers the motherboard, CPU, IDE drives, floppy and SATA devices typical of a GX520 or GX620 build, while the high-efficiency, low-ripple fan keeps acoustic noise low. Builders needing more SATA ports or a 24-pin-only motherboard without the 20+4 split should look elsewhere.

Highlights

  • Delivers 300 W steady power for Dell Optiplex GX520 and GX620
  • Reduced 5.9" depth fits tight legacy cases
  • High-efficiency fan runs quietly with low ripple
  • Over-current and over-power protection safeguards components
  • 20+4-pin ATX, 4-pin ATX12V, three SATA, three peripheral, one floppy connectors

Specifications

TypeAT

Questions about this item

Will the 5.9-inch height and 3.4-inch width fit the Dell Optiplex GX520 or GX620 chassis?

The unit measures 5.9 inches high by 3.4 inches wide with reduced depth, matching the legacy form factor used in the GX520 and GX620 cases.

How do I connect the 20+4-pin ATX and 4-pin ATX12V cables to the motherboard without forcing the keyed plugs?

Align the 20+4-pin connector with the motherboard socket so the extra four pins hang over the edge if only 20 pins are present, then seat the 4-pin ATX12V plug in the dedicated CPU power header.

When should I clean or replace the low-noise fan to keep ripple and noise low?

Blow dust from the fan intake every six to twelve months; replace the entire supply if bearing noise appears or voltages drift under load.

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