HPE ProLiant ML350 Gen9 Power Supplies
Genuine HPE Flex Slot hot-plug power supplies for the HPE ProLiant ML350 Gen9, new and refurbished. One rule governs every order on this page: mixing power supplies in the same server is not supported — every unit must match on input voltage, output rating and efficiency rating, and HPE warns that non-matching supplies produce error messages and operational problems.
ML350 Gen9 Power Supply Specifications
- Format: HPE Flexible Slot (Flex Slot) hot-plug supplies, a tool-less design shared across ProLiant Gen9 performance servers, with four supply bays on this chassis
- Outputs stocked: 500W Platinum, 800W in Platinum, Titanium, Universal and −48VDC forms, and 1400W Platinum Plus
- Input: 100 to 120 VAC or 200 to 240 VAC; the 1400W unit is rated only at 200 to 240 VAC, where the 500W and 800W units are rated from 100 VAC
- Heat output: 1979 BTU/hr on the 500W at 100 VAC, 3207 on the 800W and 5459 on the 1400W at 200 VAC — in a tower that heat lands in the room the server stands in
- Past two supplies: a third and fourth unit need the X4 RPS Enablement Kit, which HPE does not qualify with the 500W supply and also requires once drive cage count passes three
- Cooling: three fans on a non-redundant single-processor machine and four on a two-processor machine, rising to six and eight with fan redundancy, standard on performance models
Read the input line before the wattage line. HPE rates the 1400W Platinum Plus supply at 200 to 240 VAC only, where the 500W and 800W units are rated from 100 VAC — so on the 120V circuit a tower is often plugged into, the biggest supply is not an option. And mixing is not supported at all: input voltage, output rating and efficiency rating must all match.
Which Flex Slot Supply Suits Your Tower?
| Output | Grades stocked | Heat at rated input | Suits |
|---|---|---|---|
| 500W | Platinum | 1979 BTU/hr at 100 VAC | One processor, one drive cage, no accelerators |
| 800W | Platinum, Titanium, Universal, −48VDC | 3207 BTU/hr at 100 VAC | Two processors with populated cages — the common choice |
| 1400W | Platinum Plus | 5459 BTU/hr at 200 VAC | Two high-wattage processors, several cages, graphics cards |
Read the input line before the wattage line. HPE rates the 1400W Platinum Plus supply at 200 to 240 VAC only, so it is not a drop-in on the 120V circuit a tower is often plugged into, however much headroom the number suggests. Oversizing costs efficiency too: a supply running far below its rating sits away from its best efficiency point.
Choosing the Right ML350 Gen9 Power Supply
- Read the label on the installed unit first. Input voltage, output rating and efficiency rating all have to match, so the existing supply is the specification.
- Four different 800W units are listed, and they do not mix. Platinum, Titanium, Universal and −48VDC are the same wattage and still a mismatch for one another.
- Redundancy means a matched pair. One supply in a four-bay chassis is not redundant whatever its rating, and hot-plug replacement only helps when a second unit carries the load.
- −48VDC is a different world. That unit belongs on DC rectifier feeds, not on a standard wall or rack circuit.
- If the noise is the problem, look at the fans. Fan redundancy doubles the count: three to six on a single-processor machine, four to eight on a two-processor one.
Complete Your ML350 Gen9 Build
Power draw follows the processors and the cage count — see ML350 Gen9 processors and drives before sizing a supply. Also available: memory, storage controllers and networking adapters, or the full ML350 Gen9 parts listing. Background reading: fixing excessive fan noise. Other models: HPE parts by server model.
ML350 Gen9 Power Supplies FAQ
Can I mix power supplies in an ML350 Gen9?
No. HPE states that mixing power supplies in the same server is not supported and that all supplies must share the same input voltage, output rating and efficiency rating. Non-matching units produce errors rather than running at the lower rating.
What wattage power supply does an ML350 Gen9 need?
It depends on the configuration. 500W suits a lightly loaded single-processor tower, 800W covers most two-processor builds with populated cages, and 1400W is for heavily loaded machines.
Will a 1400W supply work on a normal office outlet?
HPE rates the 1400W Platinum Plus unit at 200 to 240 VAC only. The 500W and 800W supplies are rated from 100 VAC, so on a 120V circuit those are the units that apply.
How many power supplies does an ML350 Gen9 take?
The chassis has four Flex Slot bays. Two supplies need nothing extra, but a third and fourth require the X4 RPS Enablement Kit, which HPE does not qualify with the 500W supply.
Are ML350 Gen9 power supplies hot-plug?
Yes. Flex Slot supplies are hot-plug and tool-less, so in a redundant pair one unit can be replaced while the server keeps running.
How many fans does an ML350 Gen9 have?
Three on a non-redundant single-processor machine and four on a two-processor machine. Fan redundancy doubles those to six and eight, and the Redundant Fan Kit supplies four system fans plus two PCIe air baffles.
✅ Looking for a specific ML350 Gen9 power supply? Browse our full selection below.
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