PSU for 500W Power Supply DPS-500AB-20A Replacement Unit - Reliable

Our review looks at the PSU for 500W Power Supply DPS-500AB-20A, a direct replacement option for systems requiring part numbers 746177-002, 849655-003, PS-8501-2, and 849655-001. For technicians and DIY system builders needing a like-for-like internal power supply, this unit stands out for its straightforward compatibility and purpose: it is intended as a replacement PSU for systems designed around these specific models. In this review the biggest reason to buy is compatibility-the product is clearly positioned as a direct swap for those exact part numbers, which can save time and trouble when restoring a desktop or server to working order.

Key Features

• Direct compatibility: Designed to replace DPS-500AB-20A and matching service part numbers, reducing trial-and-error when sourcing a replacement.
• 500W capacity: Provides the power budget expected from a 500W PSU, suitable for typical midrange desktop and small server configurations.
• Multiple referenced part numbers: Lists 746177-002, 849655-003, PS-8501-2, and 849655-001 so technicians can match it against existing labels quickly.
• Internal power supply form: Intended as an internal component, allowing a clean factory-style replacement rather than an external adapter.
• Single-purpose design: Focused on being a compatible replacement rather than a feature-rich aftermarket unit, keeping installation straightforward.

Who It's For

This PSU is for users who have a desktop or server that originally shipped with a DPS-500AB-20A style power supply or the listed service part numbers and need a drop-in replacement. IT technicians, refurbishers, and experienced DIYers will appreciate the clarity of the compatibility listing when performing repairs or rebuilds.

It is not for users seeking a modular, high-efficiency, or gaming-oriented aftermarket PSU with aesthetic features; those wanting advanced cooling, RGB, or higher efficiency ratings should look at dedicated retail power supplies designed for performance upgrades.

Pros & Cons

Pros

• Direct part-number match simplifies replacement and reduces the risk of ordering the wrong unit.
• 500W output covers common midrange system needs without overkill complexity.
• Internal form factor restores original system layout and cabling compatibility.

Cons

• Limited specification detail provided beyond compatibility, so buyers who require exact rail voltages or efficiency certifications may need to verify with their system documentation.

Specifications

Our Verdict

This PSU is a sensible purchase for anyone who needs a like-for-like replacement for a DPS-500AB-20A or the listed service part numbers. It delivers the expected 500W capacity in an internal form factor and removes much of the guesswork when matching parts. For repairs and restorations it offers solid value, while those seeking upgraded efficiency or modular convenience should consider a purpose-built aftermarket alternative.

Frequently Asked Questions

Will this replace my DPS-500AB-20A?
Yes, it is marketed specifically as a replacement for DPS-500AB-20A and the listed service part numbers, making it suitable as a direct swap when physical and connector layouts match.

Is this a modular or external PSU?
No, this unit is an internal power supply intended to replace the original internal PSU rather than a modular or external adapter.

Does it include efficiency certification details?
Efficiency or certification specifics are not listed in the product description, so check your system documentation or contact the seller if those details are required.