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Rectangular black AT power supply unit with multiple SATA connectors

myVolts

myVolts Power Supply for HP Pavilion Desktop 550-159c

SKU CH-26ST-1RNQ1

Replacement AT power supply for HP Pavilion Desktop 550-159c with 20+4 pin ATX, 4-pin +12V, 6-pin and three SATA connectors

  • TypeAT
  • Replacement upgrade PSU for HP Pavilion 550-159c desktop
  • Standard 20+4 pin ATX connector powers the motherboard
  • Dedicated +12V 4-pin connector feeds the CPU
  • Three SATA connectors supply drives and peripherals
  • Additional 6-pin power connector supports graphics cards

Targeted Replacement PSU

The myVolts power supply is built as a direct replacement for the HP Pavilion Desktop 550-159c. It uses an AT form factor and provides the exact connector mix the original chassis expects. System integrators and owners of this specific model can restore power without adapter cables or case modifications.

Sustained Load Behaviour

The unit delivers power through a 20+4 pin ATX connector, a +12V 4-pin connector, three SATA connectors and a 6-pin power connector. This layout feeds the motherboard, processor and multiple drives simultaneously during extended work sessions. Stable output across all rails keeps the desktop reliable under continuous multi-component draw.

Upgrade Context

This supply replaces the factory unit when it fails or when added drives exceed its original connector count. The inclusion of three SATA and one 6-pin connector supports storage expansions that the stock PSU often cannot accommodate. Buyers who need more connectors than the original design provided will benefit; those requiring higher total wattage or modular cabling for a different chassis should look elsewhere.

Highlights

  • Replacement upgrade PSU for HP Pavilion 550-159c desktop
  • Standard 20+4 pin ATX connector powers the motherboard
  • Dedicated +12V 4-pin connector feeds the CPU
  • Three SATA connectors supply drives and peripherals
  • Additional 6-pin power connector supports graphics cards

Specifications

TypeAT

Questions about this item

How much heat and noise does the myVolts 550-159c PSU produce under continuous load?

The unit is a standard AT form-factor replacement; its thermal and acoustic profile matches the original HP Pavilion 550-159c supply, so expect similar fan behaviour during all-day operation.

Which cables or components must I already have to install this power supply?

You need a motherboard with a 20+4 pin ATX socket and a +12 V 4-pin CPU connector, plus SATA drives that use the three SATA power leads and one 6-pin lead supplied on the PSU.

Will the myVolts PSU work with the older hardware inside my HP Pavilion 550-159c?

Yes — it provides the same 20+4 pin ATX, +12 V 4-pin, SATA and 6-pin connectors that the original 550-159c chassis and motherboard require.

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