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Redundant fan kit improved cooling reliability.
725878-B21
HPE ML350 Gen9 Redundant Fan Kit
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725878-B21
HPE ML350 Gen9 Redundant Fan Kit
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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.
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.
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.
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.
To get the detailed certification, please go to the Compliance Center.
 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 |
Redundant fan kit improved cooling reliability.
OEM fans fit perfectly.
Quiet operation and stable airflow.
Good preventative upgrade.
Dependable cooling solution.
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.
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.
The kit includes two identical fan modules, each optimized for high airflow and balanced cooling in the ML350 Gen9 chassis.
Yes. Each fan module is hot-pluggable, allowing replacement or upgrades without powering down the server.