HP DPS-240MB-3 A 240W Power Supply Module – Compatible with DC5800, DC5850, DC7900

Is your HP Compaq desktop refusing to power on? Experiencing random restarts or that dreaded clicking sound from your system? Before you consider replacing the entire computer, there’s a much simpler and more cost-effective solution: the HP DPS-240MB-3 A 240W Power Supply Module.

Designed specifically for HP’s business-class desktop lineup, this power supply is the guaranteed drop-in replacement for HP Compaq DC5800, DC5850, and DC7900 Small Form Factor systems. It’s also compatible with the HP Compaq 6000 Pro SFF, 6005 Pro SFF, and 8000 Elite SFF – making it one of the most versatile power supplies in the HP business desktop ecosystem.

In this guide, we’ll walk you through everything you need to know about the HP DPS-240MB-3 A power supply, why it’s the right choice for your system, and what makes it a reliable workhorse for business environments.

Why Choose the HP DPS-240MB-3 A Power Supply?

When it comes to power supplies, you have two choices: generic replacements that might fit but often fail, or genuine OEM components engineered specifically for your system. The HP DPS-240MB-3 A falls firmly into the second category.

This isn’t just another power supply – it’s a genuine HP component designed to the exact specifications of your desktop. That means perfect fitment, reliable power delivery, and the peace of mind that comes with using a part that HP engineers validated for thousands of hours of operation.

The model number DPS-240MB-3 A is the exact replacement for part numbers 508504-001, 508504-002, and 503947-001. If your current power supply carries any of these numbers, this unit is your perfect match.

What Makes This PSU Stand Out?

Solid 240-Watt Output

With a maximum output of 240 watts, this power supply provides clean, stable power for business computing tasks. Whether you’re running spreadsheets, managing databases, or handling point-of-sale operations, this unit delivers the reliability you need for 8-hour workdays.

Dual +12V Rails for Superior Stability

One of the standout features of the DPS-240MB-3 A is its dual +12V rail design. Unlike single-rail power supplies that can suffer from voltage drops under heavy load, the dual-rail architecture ensures your CPU and your drives get dedicated, stable power. This means fewer crashes, better system stability, and longer component life.

The two +12V rails are rated at 15.0A and 16.0A respectively, providing plenty of headroom for your system’s components.

Proprietary HP Connector – The Right Fit

Here’s where attention to detail matters: the DPS-240MB-3 A features an HP-proprietary 14-pin power connector. This is NOT a standard ATX power supply, and that’s actually good news. Why? Because a standard ATX supply simply won’t work with these HP motherboards. By purchasing the correct OEM unit, you avoid the frustration of receiving a “compatible” power supply that doesn’t actually fit.

Comprehensive Output Rails

This PSU delivers power across six different output lines, each sized for optimal performance:

• +5.08V at 14.0A – Powers motherboard logic and USB ports

• +3.3V at 19.0A – Supplies stable voltage to chipsets and RAM

• +12.0V at 15.0A – Dedicated CPU power rail

• +12.0V at 16.0A – Power for drives and peripherals

• -12.0V at 0.15A – For legacy serial port support

• +5.08Vaux at 2.0A – Always-on standby power for Wake-on-LAN

Essential Connectors

The DPS-240MB-3 A includes all the connectors you need to power your HP system:

• 14-Pin HP Proprietary Connector – For the motherboard (please note: this is NOT standard ATX!)

• 4-Pin P4 CPU Connector – Dedicated power for the processor

• One SATA Connector – For modern hard drives and SSDs

• One 4-Pin Molex Connector – For optical drives and legacy peripherals

• One 4-Pin Floppy Connector – For legacy floppy drives if needed

Compatibility: Is It Right for Your System?

The HP DPS-240MB-3 A is designed specifically for HP Small Form Factor business desktops. Here’s the full compatibility list:

Confirmed Compatible Models:

• HP Compaq DC5800 Small Form Factor

• HP Compaq DC5850 Small Form Factor

• HP Compaq DC7900 Small Form Factor

• HP Compaq 6000 Pro SFF

• HP Compaq 6005 Pro SFF

• HP Compaq 8000 Elite SFF

Part Number Cross-Reference:

• 508504-001

• 508504-002

• 503947-001

⚠️ Critical Compatibility Note: This power supply uses an HP-proprietary 14-pin connector on the motherboard end. It is NOT compatible with standard ATX motherboards. Please verify that your system is one of the models listed above before purchasing. If you’re unsure, our team at Compvate is happy to help confirm compatibility.

Need a Replacement? Here’s What to Look For

Buying a replacement power supply can feel like navigating a maze. Here’s how to ensure you get the right part every time:

Verify the Part Number
Check your current power supply for labels reading “DPS-240MB-3 A”, “508504-001”, “508504-002”, or “503947-001”. If you see any of these numbers, this is your replacement.

Check the Form Factor
This power supply is designed specifically for Small Form Factor (SFF) systems. If your chassis is a tower or mini-tower, this is not the right unit.

Count the Pins on Your Motherboard Connector
The DPS-240MB-3 A uses a 14-pin proprietary connector. If your current power supply uses a 20-pin or 24-pin ATX connector, this unit will not work with your system.

Look at the Physical Dimensions
This power supply measures approximately 5.9 inches wide, 3.4 inches high, and 5.5 inches deep, making it a perfect fit for HP SFF chassis.

Everything You Need to Know

Let’s dive into the technical details in plain, friendly language so you know exactly what you’re getting.

Product Overview

This is the HP DPS-240MB-3 A 240W Power Supply Module, a genuine OEM replacement for HP Compaq business desktops. It’s an internal switching power supply designed specifically for Small Form Factor systems, including the HP Compaq DC5800, DC5850, DC7900, 6000 Pro SFF, 6005 Pro SFF, and 8000 Elite SFF.

The compatible part numbers are 508504-001, 508504-002, and 503947-001, with replacement part number 520135-001. The manufacturer is Delta Electronics (model number DPS-240MB-3 A), one of the most trusted names in power supply manufacturing.

Electrical Specifications

This power supply delivers a steady 240 Watts of maximum output power, providing more than enough capacity for standard business computing tasks. It supports universal input voltage of 100-240VAC at 50-60Hz, meaning it works in virtually any country worldwide without manual switching.

The unit is rated at an impressive 80% minimum efficiency, ensuring it meets modern energy standards and generates less heat than older, less efficient power supplies.

DC Output Specifications

The DPS-240MB-3 A provides six separate DC output rails to ensure clean, stable power to every component in your system:

• +5.08V rail at 14.0A – This rail powers your motherboard logic, integrated chipsets, USB ports, and other 5V-dependent components. A robust 14 amps ensures plenty of headroom for connected peripherals.

• +3.3V rail at 19.0A – The 3.3V rail is critical for modern chipsets, RAM modules, and PCI/PCIe expansion cards. At 19 amps, this rail can comfortably handle even fully populated memory slots and multiple expansion cards.

• +12.0V rail at 15.0A – Dedicated CPU power rail. Modern processors draw heavily from the +12V line, and 15 amps provides stable, clean power even under full CPU load.

• +12.0V rail at 16.0A – Second +12V rail for hard drives, optical drives, and case fans. With 16 amps, you can run multiple drives without worrying about power starvation.

• -12.0V rail at 0.15A – Supports legacy serial ports and audio circuits. While most modern systems don’t heavily use the -12V rail, it’s included for full compatibility with older peripherals.

• +5.08Vaux rail at 2.0A – The auxiliary standby rail provides always-on power for Wake-on-LAN, USB keyboard wake, and other power management features. At 2 amps, there’s enough capacity to support multiple wake-enabled devices.

Connector Configuration

The DPS-240MB-3 A includes a carefully selected set of connectors for HP SFF systems:

• One 14-Pin HP Proprietary Connector – This is the main motherboard power connector. Please note that this is NOT a standard ATX connector – it’s specifically designed for HP motherboards. Attempting to use a standard ATX power supply with these HP systems will result in a non-functional system.

• One 4-Pin P4 CPU Connector – Dedicated 12V power for your processor. This ensures your CPU receives clean, stable power independent of other system components.

• One 15-Pin SATA Connector – For connecting modern SATA hard drives and solid-state drives. With SATA support, you can use the latest high-capacity drives with your HP system.

• One 4-Pin Molex Connector – For legacy IDE devices, optical drives, or case fans. This ensures compatibility with older peripherals you might still be using.

• One 4-Pin Floppy Connector – Yes, it’s included! While floppy drives are largely obsolete, this connector is still useful for certain legacy equipment and diagnostic tools.

Physical Dimensions and Weight

• Width: Approximately 5.9 inches (standard ATX width)

• Height: Approximately 3.4 inches (standard ATX height)

• Depth: Approximately 5.5 inches (SFF-specific depth)

• Weight: Approximately 2.2 lbs (1.0 kg)

Safety and Compliance Certifications

The DPS-240MB-3 A meets rigorous safety and environmental standards:

• RoHS Compliant – Free from hazardous substances like lead and mercury, making it safer for both you and the environment.

• REACH Compliant – Meets European regulations for chemical safety.

• CE Certified – Meets European health, safety, and environmental protection standards.

• UL Listed – Tested and approved by Underwriters Laboratories for safety.

• 100% Burn-In Tested – Every unit undergoes rigorous testing before leaving the factory, ensuring reliability from day one.

• Green Power Standard – Meets modern energy efficiency requirements.

Protection Features

Your system’s components are protected by multiple built-in safety features:

• Overvoltage Protection (OVP) – Automatically shuts down the power supply if any output voltage exceeds safe levels, preventing damage to your motherboard and components.

• Overcurrent Protection (OCP) – Safeguards against excessive current draw on any output rail, protecting both the power supply and your system.

• Short Circuit Protection (SCP) – Immediately shuts down the unit in the event of a short circuit, preventing electrical fires and component damage.

• Over-Temperature Protection (OTP) – Monitors internal temperature and shuts down if the unit exceeds safe operating temperatures, preventing thermal damage.

• Overload Protection (OPP) – Prevents the power supply from delivering more power than it’s rated for, ensuring stable operation even under peak loads.

Why Buy From Compvate?

At Compvate, we know that finding the right replacement part can be time-consuming and frustrating. That’s why we make the process simple and stress-free:

• Genuine OEM Parts – We only source authentic HP components, never generic “compatible” units that can fail prematurely.

• Expert Technical Support – Our team knows HP systems inside and out. If you’re not sure about compatibility, we’re just a message away.

• Fast Shipping – We know downtime costs money. That’s why we ship orders quickly so you can get your system back online.

• Competitive Pricing – Quality replacements at prices that make sense for your budget.

• Satisfaction Guaranteed – We stand behind every product we sell.