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Compact TFX power supply unit with silver metal casing and rear fan grille

myVolts

myVolts 400 W TFX power supply for Dell Inspiron 545S 546S

SKU CH-XF40-191QF

TFX form-factor unit delivers 400 W to Dell Inspiron 545S and 546S slimline desktops with 20+4-pin motherboard, 4-pin CPU, Molex, floppy and SATA connectors

  • Product typeAT
  • Delivers 400 W steady power for demanding upgrades
  • Fits Dell Inspiron 545S and 546S slimline desktops
  • Replaces 200, 250, 300 or 350 W units with 420 W peak capacity
  • Powers motherboard, CPU, two SATA drives and legacy peripherals
  • Runs on 100/240 V input with 80 mm cooling fan

Compatible Dell SFF replacement

This TFX power supply is built for Dell Inspiron 545S and 546S small-form-factor desktops. It delivers 400 W of continuous output and can replace units rated at 200, 250, 300 or 350 W. The 20+4 pin motherboard connector, 4-pin CPU connector, two Molex, floppy and two SATA connectors cover the original wiring. An 80 mm fan handles cooling inside the slim chassis.

Check your current PSU first

Verify that the existing unit uses the TFX form factor and that the case accepts a 400 W replacement. Confirm the motherboard requires a 20+4 pin main connector and a 4-pin CPU power lead. Ensure the 100 to 240 V input range matches your mains supply. The physical dimensions must fit the original mounting points in the Inspiron 545S or 546S chassis.

Connectors expand drive options

Two SATA power leads let you add SATA hard drives or solid-state drives without adapters. Two Molex connectors support legacy peripherals such as older optical drives or fan controllers. The floppy connector remains available for specialist hardware. Together these cables remove the need for splitter cables when upgrading storage in the supported Dell models.

How it compares

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

Price $90.99
Cheaper than about 71% of the 10,869 comparable items (median $142.99).

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Specifications

Product
Product typeAT

Questions about this item

Does the unit ship with every cable required for a Dell Inspiron 545S or 546S, or must I buy extra connectors?

The power supply includes a 20+4 pin motherboard connector, a 4-pin CPU connector, two Molex plugs, a floppy connector and two SATA plugs, so no additional cables are needed for those models.

Should I choose the 400 W or 420 W rating when upgrading from a 300 W unit?

The continuous output is 400 W; 420 W is the peak figure, so the 400 W rating is the one to compare with your existing 300 W supply.

Will the 400 W continuous rating actually deliver that power inside a slimline Dell case?

Yes, the TFX form factor fits the Inspiron 545S and 546S SFF chassis and the 80 mm fan is designed to maintain airflow at the rated 400 W load.

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