HPE P03178-B21 — 1000W Flex Slot Titanium Hot-Plug Power Supply Kit
What it is
P03178-B21 is an HPE 1000W Flex Slot Titanium hot-plug power supply kit used in HPE ProLiant enterprise servers that support the Flex Slot PSU architecture. It delivers high-efficiency power and supports hot-swap replacement and redundant configurations for production environments.
Why buyers pick P03178-B21 (plain English)
High power capacity: 1000W is strong enough for heavily loaded servers with multiple CPUs, lots of memory, and many drives.
Titanium efficiency: top-tier efficiency lowers wasted power and heat compared with lower efficiency classes.
Flex Slot standard: works in many modern ProLiant Gen10 / Gen10+ / Gen11 servers with Flex Slot PSU bays.
Hot-plug replacement: swap the PSU without powering down the server (when redundancy is present).
Redundancy ready: install paired units for 1+1 power resiliency.
60-second spec box (P03178-B21)
Power output
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1000 Watts
Efficiency rating
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Titanium (highest efficiency class for server PSUs)
Form factor
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HPE Flex Slot
Installation
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Hot-plug / hot-swap
Compatibility
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HPE ProLiant servers with Flex Slot PSU architecture
Where it fits (and when to choose something else)
Perfect for:
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High-performance ProLiant servers
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Systems with heavy memory, CPU, or drive loads
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Adding redundant power for uptime-critical systems
Choose something else if:
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Your server only needs lower wattage → 500W / 800W / 1200W options
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Your platform uses non-Flex Slot PSUs
TL;DR
P03178-B21 is an HPE 1000W Flex Slot Titanium hot-plug PSU kit — high-efficiency, hot-swap power for enterprise ProLiant servers.

