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Harold Kim
5
500W power supply fit perfectly and runs quietly.
720478-B21
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HPE 500W Flex Slot Platinum Hot Plug Power Supply Kit
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Name:
720478-B21
- Description:
- HPE 500W Flex Slot Platinum Hot Plug Power Supply Kit
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- Hpe
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720478-B21 Overview
720478-B21 is an 850W modular ATX power supply designed for high efficiency and reliable performance. It features Gold 80 PLUS certification with an input voltage range of 100–240V and active PFC, while its 120mm fluid dynamic bearing fan ensures effective cooling and low noise levels even under heavy load. The unit is built with robust components that include over current (OCP), over voltage (OVP), under voltage (UVP), and short circuit protections (SCP) to maintain system safety.
This power supply comes equipped with a full set of connectors including one ATX 24-pin, two EPS (CPU) 4+4 pins, three PCIe (6+2) connectors, eight SATA power connectors, and six Molex connectors, all complemented by a sleeved cable type for improved cable management. Engineered with a zero RPM mode for silent operation and a mean time between failures (MTBF) of 150,000 hours, the 720478-B21 is an ideal choice for gaming, workstation, and server applications.
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720478-B21 Specifications
- Product Type
- Power Supply
- Wattage
- 850W
- Use Case
- Gaming
- Form Factor
- ATX
- Modularity
- Modular
- 80 PLUS Certification
- Gold
- Rail Configuration
- Single Rail
- Certifications
- 80 PLUS / CE / FCC / UL / ROHS
- Remote Monitoring
- No
- Input Voltage
- 100–240V
- Hot-Swap Capable
- No
- PFC (Power Factor Correction)
- Active PFC
- Fan Size
- 120mm
- Fan Bearing Type
- Fluid Dynamic
- Zero RPM Mode
- Yes
- Efficiency Rating
- 94%
- Protections
- OCP / OVP / UVP / SCP
- ATX 24-Pin Connectors
- 1
- EPS (CPU) 4+4 Pin
- 2
- PCIe (6+2) Connectors
- 3
- SATA Power Connectors
- 8
- Molex Connectors
- 6
- Floppy Connector
- No
- Cable Type
- Sleeved
- RGB Lighting
- No
- MTBF (Mean Time Between Failures)
- 150,000 hours
- Operating Temperature
- 50°C
- Product Name
- 720478-B21 High Efficiency Modular Power Supply
- Height
- 5.5 inches
- Width
- 6.3 inches
- Depth
- 4.5 inches
- Weight
- 4.2 lbs
720478-B21 Use Case
Mission-Critical Data Center Redundancy for 24/7 Uptime
In a global financial services environment, system architects deploy the 720478-B21 HPE 500W Flex Slot Platinum Hot Plug Power Supply Kit across dual-redundant server stacks to guarantee zero-downtime maintenance windows. By hot-swapping failed modules without powering down, operations teams maintain continuous transaction processing, reduce unplanned outages by 98%, and uphold SLAs with enterprise clients.
High-Density Virtualization for Cloud Service Providers
A cloud hosting provider integrates the 720478-B21 kit into HPE ProLiant blades to optimize rack space and energy efficiency in a high-density virtualization cluster. The 80 PLUS Platinum rating delivers up to 94% efficiency at typical loads, cutting power and cooling costs by 20% year over year. This modular power solution scales on demand, reduces PUE, and accelerates ROI on compute investments.
Edge Computing Resilience in Telecom and IoT Deployments
Telecommunications engineers install the 720478-B21 HPE 500W Flex Slot Platinum Hot Plug Power Supply Kit in remote edge cabinets to support IoT gateways and micro data centers. The compact form factor and hot-plug capability enable rapid field swapouts under harsh environmental conditions, ensuring 99.99% availability for latency-sensitive applications and minimizing truck rolls by 50%.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| 720478-B21 |  JL820A |  J2P86A |  730941-B21 |  JC087A | |
|---|---|---|---|---|---|
| Product Type | Power Supply | Power Supply | Power Supply | Power Supply | Power Supply |
| Wattage | 850W | 850W | 850W | 750W | 850W |
| Use Case | Gaming | Gaming / Workstation / Rack Server | Gaming / Workstation | Gaming / Workstation / Enterprise Server | Gaming / Workstation / Enterprise Server |
| Form Factor | ATX | ATX | ATX | ATX | ATX |
| Modularity | Modular | Modular | Modular | Modular | Modular |
| 80 PLUS Certification | Gold | Gold | Platinum | Gold | Platinum |
| Rail Configuration | Single Rail | Single Rail | Single Rail | Single Rail | Single Rail |
| Certifications | 80 PLUS / CE / FCC / UL / ROHS | 80 PLUS / CE / FCC / UL / ROHS | 80 PLUS / CE / FCC / UL / ROHS | 80 PLUS / CE / FCC / UL / ROHS | 80 PLUS / CE / FCC / UL / ROHS |
| Remote Monitoring | No | No | No | No | No |
| Input Voltage | 100–240V | 100–240V | 100–240V | 100–240V | 100–240V |
| Hot-Swap Capable | No | No | No | No | No |
| PFC (Power Factor Correction) | Active PFC | Active PFC | Active PFC | Active PFC | Active PFC |
| Fan Size | 120mm | 120mm | 120mm | 120mm | 135mm |
| Fan Bearing Type | Fluid Dynamic | Fluid Dynamic | Fluid Dynamic | Fluid Dynamic | Fluid Dynamic |
| Zero RPM Mode | Yes | Yes | Yes | Yes | Yes |
| Efficiency Rating | 94% | 92% | 96% | 92% | 94% |
| Protections | OCP / OVP / UVP / SCP | OCP / OVP / SCP / OTP | OCP / OVP / UVP / SCP / OTP / OPP | OCP / OVP / UVP / SCP / OTP | OCP / OVP / SCP / OTP |
| ATX 24-Pin Connectors | 1 | 1 | 1 | 1 | 1 |
| EPS (CPU) 4+4 Pin | 2 | 1 | 1 | 2 | 1 |
| PCIe (6+2) Connectors | 3 | 2 | 2 | 3 | 2 |
| SATA Power Connectors | 8 | 6 | 6 | 6 | 6 |
| Molex Connectors | 6 | 4 | 4 | 4 | 4 |
| Floppy Connector | No | No | No | No | No |
| Cable Type | Sleeved | Sleeved | Sleeved | Sleeved | Sleeved |
| RGB Lighting | No | No | No | No | No |
| MTBF (Mean Time Between Failures) | 150,000 hours | 150,000 hours | 150,000 hours | 150,000 hours | 150,000 hours |
| Operating Temperature | 50°C | 50°C | 50°C | 50°C | 50°C |
| Product Name | 720478-B21 High Efficiency Modular Power Supply | JL820A 850W Fully Modular ATX Power Supply | J2P86A Ultra Modular Platinum ATX PSU | 730941-B21 High Performance Modular ATX Power Supply | JC087A High-Efficiency Platinum Modular ATX Power Supply |
| Height | 5.5 inches | 5.0 inches | 5.1 inches | 5.5 inches | 5.5 inches |
| Width | 6.3 inches | 8.6 inches | 5.9 inches | 6.3 inches | 8.6 inches |
| Depth | 4.5 inches | 6.3 inches | 8.1 inches | 5.1 inches | 6.3 inches |
| Weight | 4.2 lbs | 4.5 lbs | 7.5 lbs | 3.2 lbs | 3.2 lbs |
Reviews & Ratings
N
Nimra Khalid
5
Hot plug replacement was seamless.
R
Reto Meier
4
Stable power delivery.
J
Jibran Ahmed
5
Good efficiency rating.
S
Sandra Lewis
5
Reliable server power option.
Questions & Answers
What is the HPE 500W Flex Slot Platinum Hot Plug Power Supply Kit (SKU: 720478-B21)?
The HPE 500W Flex Slot Platinum Hot Plug Power Supply Kit (720478-B21) is a high-efficiency, hot-swappable power supply designed for select HPE ProLiant rack servers, delivering reliable 500W output with 80 PLUS Platinum energy efficiency.
Which HPE servers are compatible with SKU 720478-B21?
The 720478-B21 power supply is compatible with HPE ProLiant DL380 Gen8, DL360 Gen8, DL380 Gen9, DL360 Gen9, and other Flex Slot-enabled HPE rack servers.
What does 80 PLUS Platinum certification mean for this power supply?
80 PLUS Platinum certification ensures up to 94% energy efficiency under typical load conditions, reducing power consumption, lowering heat output, and minimizing operating costs.
How does the hot-plug feature improve server uptime?
The hot-plug design allows replacement or addition of the power supply without shutting down the server, avoiding downtime and ensuring continuous operation during maintenance.
Can I mix the HPE 500W Platinum PSU with other wattage modules?
For optimal performance and redundancy, HPE recommends using identical 500W Flex Slot Platinum power supplies (SKU 720478-B21) in all redundant bays.
How do I install the HPE 500W Flex Slot Platinum PSU?
Power off the server or use redundancy, slide the PSU into the empty Flex Slot bay until it clicks, connect the AC power cord, and verify LED status for successful installation.
Does SKU 720478-B21 support redundant power configurations?
Yes, the 500W Flex Slot Platinum PSU supports N+1 and N+N redundancy in HPE ProLiant servers when installed in multiple bays.
What are the physical dimensions and weight of this power supply?
The HPE 500W Flex Slot Platinum PSU measures 38.1 x 6.9 x 23.0 cm and weighs approximately 1.8 kg, fitting standard Flex Slot bays.
What input voltage range does the power supply support?
The PSU accepts a universal AC input range of 100–240 VAC at 50/60 Hz, supporting global deployment without manual voltage selection.
What is the operating temperature range for the 500W Platinum PSU?
The operating temperature range is 10°C to 35°C (50°F to 95°F), meeting HPE server environmental guidelines for optimal reliability.
How can I monitor the power supply status?
Use the server’s Integrated Lights-Out (iLO) management interface or front-panel LEDs to view PSU health, load, and fault indicators in real time.
What warranty covers the HPE 720478-B21 power supply?
HPE provides a three-year limited warranty for the 500W Flex Slot Platinum Hot Plug PSU, covering defects in materials and workmanship.
Where can I purchase replacement units for SKU 720478-B21?
You can order genuine HPE 720478-B21 power supplies through authorized HPE resellers, the HPE Parts Store, or certified system integrators.
How do I troubleshoot a non-operational power supply?
Check AC power connection, verify LED status, reseat the module, review iLO event logs, and replace the PSU if the fault LED remains lit.
What noise level can I expect from this power supply?
Under normal load, the HPE 500W Flex Slot Platinum PSU operates at approximately 40 dBA, ensuring a balanced acoustic profile in data center environments.
How does the HPE 500W Flex Slot PSU contribute to energy savings?
With up to 94% efficiency and active power factor correction, the 500W Flex Slot Platinum PSU reduces energy waste, lowers utility costs, and supports green IT initiatives.