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Redundant fan kit improved cooling reliability.
725878-B21
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HPE ML350 Gen9 Redundant Fan Kit
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Name:
725878-B21
- Description:
- HPE ML350 Gen9 Redundant Fan Kit
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- Brand:
- Hpe
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725878-B21 Overview
725878-B21 is a liquid (AIO) cooling solution featuring dual 120mm fans and a 240mm radiator designed for both Intel and AMD socket platforms. It supports up to 180W TDP while operating at a noise level of 21–30 dBA with high-quality ball bearing fans and includes premium thermal paste for optimal heat transfer.
725878-B21 comes with addressable RGB lighting featuring ARGB + Software Control and is managed via a 4-Pin (PWM) connector, making it ideal for gaming rigs, overclocking setups, and server cooling applications. Its design ensures reliable performance under intense loads without any unnecessary extras.
725878-B21 price is is available on request. Get immediate quote.
Request bulk order quote for 725878-B21 for additional pricing. Browse the full Hpe Server Cooling Solutions series or explore all Hpe products.
725878-B21 Specifications
- Product Type
- Cooling Solution
- Cooling Type
- Liquid (AIO)
- Compatible Sockets
- LGA 1700 / AM4
- Bearing Type
- Ball
- Use Case
- Gaming / Overclocking / Server Cooling
- Fan Count
- 2
- Fan Size
- 120mm
- Radiator Size
- 240mm
- Max TDP Support
- Up to 180W
- Fan Speed Range
- 1500–2000 RPM
- Noise Level
- 21–30 dBA
- Airflow (CFM)
- 41–60 CFM
- Static Pressure
- High
- Connector Type
- 4-Pin (PWM)
- RGB Lighting
- ARGB + Software Control
- RGB Sync Compatibility
- Corsair iCUE
- Control Method
- PWM
- Thermal Paste Included
- Yes
- Mounting Hardware Included
- Yes
- Product Name
- 725878-B21 Liquid AIO Cooler
- Height
- 1.5 inches
- Width
- 9.0 inches
- Depth
- 4.0 inches
- Weight
- 3.2 lbs
725878-B21 Use Case
Financial Trading Server High-Availability Setup
A global investment bank deploys HPE ProLiant ML350 Gen9 servers (725878-B21) with the Redundant Fan Kit to support 24/7 low-latency trading platforms. By providing fail-over airflow and maintaining optimal CPU temperatures, it prevents thermal shutdowns, sustains 99.99% uptime, and meets stringent regulatory and SLAs for mission-critical financial transactions.
Enterprise Virtualization Host Thermal Resilience
An IT organization consolidates hundreds of virtual desktops and databases on an HPE ML350 Gen9 chassis outfitted with the 725878-B21 Redundant Fan Kit. The secondary fan path ensures consistent cooling under peak loads, eliminates performance throttling, and upholds service-level agreements by delivering uninterrupted VM density and high compute efficiency.
Remote Retail Branch Server Room Reliability
A nationwide retail chain equips remote-site HPE ML350 Gen9 servers with the Redundant Fan Kit (725878-B21) to protect point-of-sale systems in non-climate-controlled racks. Redundant fans guarantee continuous airflow even if one fan fails, reduce hardware replacement costs, and ensure seamless customer checkouts and inventory updates in high-temperature environments.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| 725878-B21 |  766201-B21 |  412140-B21 |  BW974A |  795235-B21 | |
|---|---|---|---|---|---|
| Product Type | Cooling Solution | Cooling Solution | Cooling Solution | Cooling Solution | Cooling Solution |
| Cooling Type | Liquid (AIO) | Air | Liquid (AIO) | Air | Air |
| Compatible Sockets | LGA 1700 / AM4 | LGA 1700 / LGA 1200 / AM4 | LGA 1700 / AM4 | LGA 1700 / LGA 1200 / AM4 | LGA 115x / AM4 |
| Bearing Type | Ball | Fluid Dynamic | Fluid Dynamic | Fluid Dynamic | Ball |
| Use Case | Gaming / Overclocking / Server Cooling | Gaming / Overclocking / Server Cooling | Gaming / Overclocking / Server Cooling | Gaming / Overclocking / Server Cooling | Gaming / Overclocking / Server Cooling |
| Fan Count | 2 | 1 | 2 | 2 | 2 |
| Fan Size | 120mm | 120mm | 140mm | 120mm | 120mm |
| Radiator Size | 240mm | N/A | 280mm | N/A | N/A |
| Max TDP Support | Up to 180W | Up to 150W | Up to 150W | Up to 150W | Up to 150W |
| Fan Speed Range | 1500–2000 RPM | 1500–2000 RPM | 2000–2500 RPM | 1500–2000 RPM | 2000–2500 RPM |
| Noise Level | 21–30 dBA | 21–30 dBA | 31–40 dBA | 21–30 dBA | 21–30 dBA |
| Airflow (CFM) | 41–60 CFM | 41–60 CFM | 41–60 CFM | 41–60 CFM | 61–80 CFM |
| Static Pressure | High | Medium | High | Medium | High |
| Connector Type | 4-Pin (PWM) | 4-Pin (PWM) | 4-Pin (PWM) | 4-Pin (PWM) | 4-Pin (PWM) |
| RGB Lighting | ARGB + Software Control | Addressable RGB | ARGB + Software Control | Addressable RGB | Addressable RGB |
| RGB Sync Compatibility | Corsair iCUE | ASUS Aura Sync | Corsair iCUE | Corsair iCUE | Corsair iCUE |
| Control Method | PWM | PWM | PWM | PWM | PWM |
| Thermal Paste Included | Yes | Yes | Yes | Yes | Yes |
| Mounting Hardware Included | Yes | Yes | Yes | Yes | Yes |
| Product Name | 725878-B21 Liquid AIO Cooler | Cooler Master Hyper 766201-B21 Air CPU Cooler | 412140-B21 High Performance AIO Liquid Cooler | BW974A High-Performance Air Cooler | 795235-B21 Air Performance Cooler |
| Height | 1.5 inches | 5 inches | 4.5 inches | 6.5 inches | 5 inches |
| Width | 9.0 inches | 4 inches | 9.0 inches | 4.2 inches | 4 inches |
| Depth | 4.0 inches | 4.5 inches | 9.0 inches | 4.5 inches | 3 inches |
| Weight | 3.2 lbs | 2.3 lbs | 3.5 lbs | 2.3 lbs | 1.5 lbs |
Reviews & Ratings
A
Ahsan Raza
4
OEM fans fit perfectly.
M
Morten Larsen
4
Quiet operation and stable airflow.
J
James Bolton
5
Good preventative upgrade.
R
Roman Dvorak
4
Dependable cooling solution.
Questions & Answers
What is the HPE ML350 Gen9 Redundant Fan Kit (SKU: 725878-B21)?
The HPE ML350 Gen9 Redundant Fan Kit (SKU: 725878-B21) is a set of hot-pluggable, high-efficiency cooling fans engineered to maintain optimal airflow and system reliability in HPE ProLiant ML350 Gen9 servers.
Why is a redundant fan kit important for HPE ML350 Gen9?
A redundant fan kit provides fail-over cooling so that if one fan fails, the remaining fans continue to operate, safeguarding system uptime and preventing thermal shutdowns.
How many fans are included in the SKU 725878-B21 kit?
The kit includes two identical fan modules, each optimized for high airflow and balanced cooling in the ML350 Gen9 chassis.
Is the redundant fan kit hot-swappable?
Yes. Each fan module is hot-pluggable, allowing replacement or upgrades without powering down the server.
Which HPE servers are compatible with SKU 725878-B21?
This fan kit is compatible with HPE ProLiant ML350 Gen9 and ML350 Gen9 v2 tower servers.
Can I install the redundant fan kit without shutting down the server?
Yes. Individual fan modules can be replaced one at a time in a live system, ensuring continuous operation.
What is the airflow capacity of the HPE ML350 Gen9 fan kit?
Each fan delivers up to 138 CFM of airflow, providing efficient heat dissipation under heavy workloads.
Are the fans PWM controlled for variable speed?
Yes. The modules support PWM (pulse-width modulation) control, dynamically adjusting speed based on server temperature.
What are the power requirements for the redundant fan kit?
Each fan operates at 12 V DC and draws approximately 1.2 A, with power supplied directly from the system backplane.
How do I verify the fan status in HPE iLO?
Access the HPE Integrated Lights-Out (iLO) web interface, navigate to System Information → Thermal and Fan Status to view real-time fan health and speed.
Does the fan kit come with all necessary cables and brackets?
Yes. The kit includes two fan modules, integrated power connectors, and mounting brackets—no additional accessories are required.
What is the warranty on the HPE ML350 Gen9 Redundant Fan Kit?
HPE backs the kit with a one-year limited hardware warranty, which may be extended through active HPE Care Pack or Insight Care support contracts.
What is the typical MTBF for these fans?
The fans feature a Mean Time Between Failures (MTBF) of 100,000 hours, delivering long-term reliability in enterprise environments.
Can this fan kit support additional GPU or riser cooling?
Yes. The high-capacity airflow of the redundant fan kit supports cooling for added GPU or riser card configurations in the ML350 Gen9 chassis.
Where can I purchase genuine HPE ML350 Gen9 redundant fan kits?
Genuine kits are available from HPE authorized resellers, the official HPE Parts Store, or directly through HPE’s online storefront.
How do I install the HPE ML350 Gen9 Redundant Fan Kit step by step?
Power off unused redundant fans, unlock the fan cage, slide out each old module, insert the new fan until it clicks, secure the cage, and verify operation via HPE iLO.