HPE ProLiant DL388 Gen9 Power Supplies
Genuine HPE Flex Slot hot-plug power supplies for the HPE ProLiant DL388 Gen9, new and refurbished. Two rules govern every order on this page: the platform takes a maximum of two supplies, and every supply in the server must match on input voltage, output rating and efficiency rating — a mismatched pair returns errors rather than simply running at the lower figure.
DL388 Gen9 Power Supply Specifications
- Format: HPE Flex Slot hot-plug supplies, the shared electrical and physical design used across ProLiant Gen9 servers, installed tool-lessly
- Outputs stocked: 500W, 800W and 1400W, so the supply can be sized to the configuration rather than over-specified
- Efficiency: all three are 80 PLUS Platinum certified with an efficiency rating of up to 94%; the 1400W unit is a Platinum Plus part
- Maximum per server: two Flex Slot supplies, which is also what a redundant pair costs
- Matching requirement: input voltage, output rating and efficiency rating must all be the same across both bays
- Power Discovery Services: supported on the 1400W Flex Slot option; the 500W and 800W units do not carry it
Mixing power supplies is not supported, and two is the ceiling. Every supply in the server must share the same input voltage, output rating and efficiency rating — two 800W units are still a mismatch if their efficiency grades differ. Read the label on the installed unit before ordering the second, because that unit is the specification.
Which Output Suits Your Configuration?
| Output | Grade | Suits |
|---|---|---|
| 500W | Flex Slot Platinum | One processor, a modest drive count, no accelerator cards |
| 800W | Flex Slot Platinum | Two processors with a populated front end — the common choice |
| 1400W | Flex Slot Platinum Plus | Two high-wattage processors, a full cage and PCIe cards, with Power Discovery Services |
The processor pair moves this number more than anything else: two 160W E5-2687W v3 parts and a full drive cage is a different budget from two 55W E5-2630L v3 parts in the same chassis. Oversizing is not free either, since a supply running far below its rating sits away from its best efficiency point, so on a server being topped up rather than rebuilt the fitted unit is usually the right specification.
Choosing the Right DL388 Gen9 Power Supply
- Read the label on the installed unit first. Matching output and efficiency rating is a requirement rather than a preference, so the existing supply is the specification for the second one.
- Redundancy means two identical supplies. A single unit in a two-bay chassis is not redundant whatever its rating, and two is the maximum the platform accepts.
- Size to the processors and the drives. A pair of 145W processors, a filled cage and a graphics accelerator is what the 1400W unit exists for.
- Power Discovery Services comes with the 1400W only. If that feature is the reason for the purchase, the smaller units will not provide it.
Complete Your DL388 Gen9 Build
Power draw follows the processors and the drive count, so size a supply against DL388 Gen9 processors and drives. Also available: DL388 Gen9 memory, storage controllers and networking adapters, or the full DL388 Gen9 parts listing. Background reading: how to fix excessive fan noise in ProLiant servers.
DL388 Gen9 Power Supplies FAQ
Can I mix power supplies in a DL388 Gen9?
No. All power supplies in the server must share the same input voltage, output rating and efficiency rating. Installing a non-matching unit may produce an error message or operational problems rather than simply running at the lower rating.
How many power supplies does a DL388 Gen9 take?
Two at most. A redundant configuration is two identical Flex Slot supplies, and a single supply in a two-bay chassis is not redundant however it is rated.
What wattage power supply do I need?
It depends on the build. 500W suits a lightly loaded single-processor server, 800W covers most two-processor configurations with a populated front end, and 1400W is for high-wattage processor pairs, full drive cages and accelerator cards.
Are these power supplies hot-plug?
Yes. Flex Slot supplies are hot-plug and install tool-lessly, so in a matched redundant pair one can be replaced while the server keeps running.
What is Power Discovery Services and which supply has it?
It is an HPE facility that lets a supply report itself to compatible intelligent rack PDUs. Of the units listed for this server, support comes with the 1400W Flex Slot option.
Does a Platinum supply have to be paired with another Platinum?
Yes. Efficiency rating is part of the matching requirement, so two supplies of the same wattage but different efficiency grades are still a mismatch.
✅ Looking for a specific DL388 Gen9 power supply? Browse our full selection below.
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