HP Z2 G4 Power Supply – Replacement & Compatibility Guide

Is your HP Z2 G4 workstation failing to power on? Finding the right replacement power supply requires careful attention to your specific chassis type. The HP Z2 G4 was released in two distinct form factors—Tower (MT) and Small Form Factor (SFF) —and each uses a completely different power supply. This guide covers everything you need to know about HP Z2 G4 power supply options, compatibility, and where to find the right replacement.

Understanding Your HP Z2 G4 Chassis Type

The most important step in finding the correct power supply is identifying whether you have a Tower or SFF model. The power supply specifications are significantly different between the two.

Quick Identification Guide

• Tower (MT) Model: Taller and wider chassis, uses larger power supplies (250W, 500W, or optional higher wattage)

• SFF Model: Compact, space-saving design, uses smaller proprietary power supplies (250W or 310W)

HP Z2 G4 Tower (MT) Power Supply Options

The Tower version of the HP Z2 G4 offers multiple power supply configurations to match different performance needs.

250W Power Supply (Standard Option)

The base configuration for the Z2 Tower G4 comes with a 250W internal power adapter. This is suitable for basic workstation configurations without high-power components.

500W Power Supply (Upgraded Option)

HP also offers a 500W power supply for the Z2 Tower G4. This is recommended for systems with more demanding hardware, such as high-end graphics cards or additional storage.

650W Power Supply (Maximum Option)

For the most demanding configurations, a 650W power supply is available. This provides ample power for high-performance components.

Compatibility Notes for Tower Models

• The 500W and 650W power supplies share the same mounting footprint and are physically compatible with the Tower chassis

• The larger power supplies (500W/650W) use the same connector configuration as the standard models, making them potential drop-in replacements

• Always verify physical dimensions before purchasing, as some models have different sizes

HP Z2 G4 SFF Power Supply Options

The Small Form Factor version uses a compact, proprietary power supply designed specifically for the smaller chassis.

250W SFF Power Supply (Entry Configuration)

Some configurations of the Z2 SFF G4 come with a 250W power supply.

Key Part Numbers:

• L28758-001 – Power supply unit ENT18 250W SFF EPA92

310W SFF Power Supply (Standard Configuration)

Most HP Z2 SFF G4 workstations ship with a 310W power supply featuring 90% efficiency and active Power Factor Correction.

Key Specifications:

• 310W power provided

• 90% efficiency

• Active Power Factor Correction

• 100-240V AC input (auto-sensing)

Compatibility Notes for SFF Models

The Z2 SFF G4 uses a proprietary “P2” 7-pin power connector. HP Z2 SFF G5 power supplies share the same connector and are interchangeable with G4 models in most cases.

Potential Replacement Options (G5 SFF Models):

• M09033-001 – 260W SFF power supply

How to Identify Your Current Power Supply

1. Confirm the Chassis Type

Check the physical size of your workstation. If it’s tall and can accommodate full-height expansion cards, it’s a Tower model. If it’s compact and slim, it’s an SFF model.

2. Inspect the PSU Label

Record the following information from the label on your current power supply:

• Wattage

• Model/Part Number

• Manufacturer

• Voltage and current ratings

3. Compare Connectors

The Z2 G4 uses proprietary connectors. Document the connector types and pin counts before purchasing a replacement.