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Compact TFX power supply unit, silver metal casing, 80mm fan grille visible

myVolts

myVolts TFX Power Supply 350W 420W Max Dell Liteon PS-5251-5

SKU CH-PRE3-2S8NS

TFX power supply delivering 350 W continuous and 420 W peak for Dell Liteon PS-5251-5 small-form-factor desktops

  • Product typeAT
  • Replaces Dell Liteon PS-5251-5 units directly
  • Delivers 350 W continuous and 420 W peak power
  • Fits slimline and SFF chassis with TFX form factor
  • Runs on 100 to 240 V input worldwide
  • Includes 20+4 pin, 4-pin CPU, Molex, floppy and SATA connectors

myVolts TFX 350W Replacement PSU

This myVolts TFX power supply delivers a continuous 350 W output with a 420 W peak rating. It is designed to replace the Dell Liteon PS-5251-5 unit in slimline and small-form-factor desktops. The AT-type form factor fits the same chassis cut-out as the original 200 W, 250 W, 300 W or 350 W models. Builders upgrading an aging Dell SFF system will find a direct mechanical and electrical match.

Sustained-load behaviour

The unit is rated for 350 W continuous power rather than only a short burst. An 80 mm double ball-bearing fan provides active cooling during extended workloads. Input voltage auto-ranges from 100 V to 240 V, so the supply maintains stable rails across different mains conditions. The peak capacity of 420 W handles brief transients without tripping protection circuits.

Installation notes

The cable harness includes a 20+4 pin motherboard connector, a 4-pin CPU plug, two Molex, a floppy connector and two SATA leads. Match each plug to the corresponding socket on the motherboard and drives; the keyed headers prevent mis-insertion. The TFX enclosure slides into the existing bracket and secures with the original screws. Builders needing additional SATA or PCIe connectors beyond the supplied set will require adapter cables.

How it compares

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

Price $66.99
Cheaper than about 81% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeAT

Questions about this item

How loud is the 80 mm fan under continuous load?

The 80 mm double ball-bearing fan runs quietly at idle and increases speed only when the 350 W load demands extra airflow.

Which motherboard and CPU connectors are required for the TFX unit to power on?

The unit provides a 20+4 pin ATX motherboard connector and a 4-pin CPU connector; both must be seated for the system to start.

Will the 20+4 pin and 4-pin CPU cables reach the headers on a legacy Dell SFF board?

Cable lengths follow the TFX form factor, matching the routing of the original PS-5251-5 in Dell slimline and SFF chassis.

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