HPE Hot-Plug Redundant Plug-in Module 500 Power Supply - Efficient

Our review of the HPE Hot-Plug Redundant Plug-in Module 500 finds it best suited for data center and enterprise server administrators who need a compact, serviceable power option that prioritizes efficiency. The unit's primary appeal is its high conversion efficiency and hot-plug, tool-less access, which reduce energy waste and minimize downtime during maintenance. For teams standardizing spares across ProLiant DL300 Gen9 systems, this power supply offers a clear operational benefit while freeing chassis space for extra options thanks to its smaller flex slot form factor.

Key Features

• 96% power efficiency: Delivers up to 96% conversion efficiency to reduce server power draw and lower operating costs in dense racks.
• 80Plus certification: The high-efficiency rating (described in materials as platinum/titanium-class) helps cut waste heat and cooling demand in the data center.
• Flex slot compact form: A form factor about 25% smaller than prior generations creates room for additional server components without changing chassis footprint.
• Hot-plug serviceability: Tool-less, hot-plug access lets technicians replace or upgrade power supplies quickly to reduce downtime.
• Battery backup option: Compatible with an HP flexible slot battery backup that can provide 750W for up to 60 seconds to bridge brief outages.
• Platform support: Designed to be compatible across the ProLiant DL300 Gen9 family to simplify spare parts and deployment.

Who It's For

The HPE 500W flex slot power supply is aimed at IT teams managing ProLiant DL300 Gen9 servers or similar HP systems that value energy efficiency and ease of service. Organizations operating multiple racks will benefit from the reduced power waste and the smaller form factor, which can permit additional internal options without reworking chassis layouts.

It is not targeted at desktop or consumer markets; small offices with non-HP servers or legacy chassis may need to verify mechanical and platform compatibility. Buyers who require longer battery runtime or different wattage levels should confirm the specific flex slot battery and power options before purchase.

Pros & Cons

Pros

• High conversion efficiency reduces running costs and cooling requirements in dense environments.
• Compact flex slot design frees internal space for additional server options.
• Tool-less hot-plug access improves serviceability and minimizes maintenance downtime.
• Supported across ProLiant DL300 Gen9 servers, simplifying spare management.

Cons

• Specific to HP flex slot systems, so compatibility with non-HP or older servers may be limited.
• Battery backup capability requires an optional flex slot battery to achieve the 750W/60s runtime.

Specifications

Brand	HP
Model	Hot-Plug Redundant Plug-in Module 500
Form Factor	Flex slot (approx 25% smaller than previous generation)
Efficiency	Up to 96% with 80Plus platinum/titanium-class certification
Battery Backup Option	Supports HP flex slot battery backup, 750W up to 60 seconds
Platform Support	ProLiant DL300 Gen9 server family

Our Verdict

The HPE Hot-Plug Redundant Plug-in Module 500 is a pragmatic choice for enterprise teams running ProLiant DL300 Gen9 servers who need high efficiency, compact design, and easy serviceability. It represents good value where rack density and power costs matter, provided buyers confirm platform compatibility and whether the optional battery backup is required for their uptime needs.

Frequently Asked Questions

Is this power supply compatible with non-ProLiant servers?
It is designed for the HP flex slot form factor and ProLiant DL300 Gen9 family, so compatibility with non-HP or older servers is unlikely without matching chassis support.

Does the unit include battery backup?
The flex slot battery backup is an optional component; the power supply supports a 750W battery option that can provide up to 60 seconds of runtime when installed.

How does the efficiency affect operating costs?
With up to 96% efficiency and 80Plus-class certification, the supply reduces energy waste and can lower cooling and power expenses in high-density deployments.