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Power supply delivered stable output and hot swap support.
720484-B21
HP 800W FLEX SLOT UNIVERSAL HOT PLUG POWER SUPPLY
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Name:
720484-B21
- Description:
- HP 800W FLEX SLOT UNIVERSAL HOT PLUG POWER SUPPLY
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- Brand:
- Hpe
- Condition:
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720484-B21 Overview
720484-B21 is a 650W high-performance ATX power supply designed for gaming and workstation applications. It features a semi-modular design, boasts an 80 PLUS Gold certification for exceptional efficiency, supports an input voltage range of 100–240V, and incorporates Active PFC for improved power quality.
This power supply comes equipped with a 120mm fan using a fluid dynamic bearing to ensure low noise levels even under load. It offers comprehensive safeguards including OCP, OVP, SCP, and OTP, and provides essential connectors such as one ATX 24-pin, one EPS (CPU) 4+4 pin, two PCIe (6+2) connectors, four SATA, and two Molex connectors, all built into a robust chassis that guarantees long-term reliability.
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720484-B21 Specifications
- Product Type
- Power Supply
- Wattage
- 650W
- Use Case
- Gaming / Workstation
- Form Factor
- ATX
- Modularity
- Semi-Modular
- 80 PLUS Certification
- Gold
- Rail Configuration
- Single Rail
- Certifications
- 80 PLUS / UL / CE / FCC
- 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
- 90%
- Protections
- OCP / OVP / SCP / OTP
- ATX 24-Pin Connectors
- 1
- EPS (CPU) 4+4 Pin
- 1
- PCIe (6+2) Connectors
- 2
- SATA Power Connectors
- 4
- Molex Connectors
- 2
- Floppy Connector
- No
- Cable Type
- Sleeved
- RGB Lighting
- No
- MTBF (Mean Time Between Failures)
- 150,000 hours
- Operating Temperature
- 50°C
- Product Name
- 720484-B21 High-Performance ATX Power Supply
- Height
- 5 inches
- Width
- 6 inches
- Depth
- 5 inches
- Weight
- 4 lbs
720484-B21 Use Case
Data Center High-Availability Redundant Power Architecture
In a large enterprise data center running HP ProLiant blade servers, the 720484-B21 HP 800W Flex Slot Universal Hot Plug Power Supply is deployed in an N+1 redundant configuration. When a primary module fails or requires maintenance, the hot-plug design allows on-the-fly replacement without server downtime. Benefit: Ensures continuous operations, reduces unplanned outages, and simplifies power module maintenance workflows.
Telecom Network Edge Equipment Power Backup
A national telecom operator powers remote edge routers and switches in distributed POPs using the 720484-B21 HP 800W Flex Slot Universal Hot Plug Power Supply. Technicians perform live swap-outs of faulty units in harsh environments, while the universal slot compatibility supports multiple chassis types. Benefit: Maximizes service availability, cuts mean time to repair (MTTR) by 50%, and streamlines field inventory management.
Virtualized Infrastructure for Cloud and Hosting Providers
A cloud hosting provider upgrades its VMware ESXi clusters with the 720484-B21 HP 800W Flex Slot Universal Hot Plug Power Supply to deliver consistent power under varying VM loads. The modular design allows capacity scaling and hot-swap replacement during peak usage windows with zero impact on running virtual machines. Benefit: Delivers higher SLA compliance, boosts rack power density, and reduces hardware lifecycle costs through standardized power modules.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 720484-B21 |  865438-B21 |  867876-B21 |  865428-B21 |  775595-B21 | |
|---|---|---|---|---|---|
| Product Type | Power Supply | Power Supply | Power Supply | Power Supply | Power Supply |
| Wattage | 650W | 750W | 1500W | 850W | 850W |
| Use Case | Gaming / Workstation | Enterprise Server / Workstation / Gaming | Gaming | Gaming | Gaming / Workstation / Enterprise Server |
| Form Factor | ATX | ATX | ATX | ATX | ATX |
| Modularity | Semi-Modular | Modular | Modular | Modular | Modular |
| 80 PLUS Certification | Gold | Gold | Gold | Gold | Gold |
| Rail Configuration | Single Rail | Single Rail | Single Rail | Single Rail | Single Rail |
| Certifications | 80 PLUS / UL / CE / FCC | 80 PLUS / CE / FCC | 80 PLUS / CE / FCC / UL / ROHS | 80 PLUS / CE / FCC / UL / CB / TUV / 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 | 140mm | 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 | 90% | 94% | 92% | 92% | 94% |
| Protections | OCP / OVP / SCP / OTP | OCP / OVP / UVP / SCP / OTP | OCP / OVP / UVP / SCP / OTP | OCP / OVP / SCP | OCP / OVP / SCP |
| ATX 24-Pin Connectors | 1 | 1 | 1 | 1 | 1 |
| EPS (CPU) 4+4 Pin | 1 | 1 | 2 | 1 | 2 |
| PCIe (6+2) Connectors | 2 | 2 | 4 | 2 | 4 |
| SATA Power Connectors | 4 | 6 | 8 | 4 | 8 |
| Molex Connectors | 2 | 3 | 4 | 2 | 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 | 720484-B21 High-Performance ATX Power Supply | 865438-B21 High Performance ATX Power Supply | 867876-B21 Ultra Performance Power Supply | 865428-B21 High Performance Modular ATX Power Supply | 775595-B21 850W Modular ATX Gold Power Supply |
| Height | 5 inches | 5.0 inches | 5.5 inches | 5 inches | 5.5 inches |
| Width | 6 inches | 6.3 inches | 6.3 inches | 5.9 inches | 5.9 inches |
| Depth | 5 inches | 5.9 inches | 11 inches | 11 inches | 6.3 inches |
| Weight | 4 lbs | 8.5 lbs | 4.8 lbs | 6.2 lbs | 4.5 lbs |
Reviews & Ratings
N
Naveed Akram
4
OEM PSU fit perfectly.
H
Henrik Olsen
5
Reliable redundant power option.
J
James Porter
3
Quiet and efficient.
R
Rui Matos
4
Dependable enterprise PSU.
Questions & Answers
What is the HP 800W Flex Slot Universal Hot Plug Power Supply?
The HP 800W Flex Slot Universal Hot Plug Power Supply (SKU 720484-B21) is a high-efficiency, hot-swappable power module designed for ProLiant and BladeSystem servers. It delivers up to 800 watts of redundant, fault-tolerant power in a compact flex-slot form factor.
Which HP servers are compatible with the HP 800W Flex Slot Universal Hot Plug Power Supply?
This power supply is compatible with HPE ProLiant Gen8, Gen9, Gen10, Gen10 Plus rack and tower servers and select C-Class BladeSystem enclosures. Always verify compatibility in your server’s QuickSpecs or HPE part reference guide.
How do I install the HP 800W Flex Slot Universal Hot Plug Power Supply?
To install, power down the server if required, align the flex-slot PSU with the chassis bay, slide it in until it clicks, then secure the retention latch. For hot-plug capable systems, insertion and removal can occur without powering off.
Can I hot-plug the HP 800W Flex Slot Power Supply without downtime?
Yes. In servers that support hot-plug power supplies, you can replace or add the HP 800W Flex Slot PSU while the system remains online and operational, ensuring continuous availability.