United States$5,000,000+
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K
Kevin Moore
5
SFP+ adapter provided low latency and stability.
732456-B21
HPE FlexFbr 10Gb 2P 556FLR-SFP+FIO Adptr
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732456-B21
- Description:
- HPE FlexFbr 10Gb 2P 556FLR-SFP+FIO Adptr
- Rating:
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- Hpe
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- Warranty:
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- List Price:
$313.61
- Price:
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732456-B21 Overview
732456-B21 is a high-performance Ethernet adapter engineered for data centers and high-speed workstations. It delivers a reliable 10Gbps data rate via a PCIe connection interface, and it is fully compatible with major operating systems such as Windows, Linux, and macOS while supporting critical network protocols including TCP/IP, UDP, iSCSI, and NFS.
This internal PCIe card is designed to meet the demands of both enterprise and small office networks, featuring support for auto-negotiation, Wake-on-LAN, jumbo frames, and QoS. Its robust build quality and optimized performance make it ideal for environments that require high-speed and dependable network connectivity.
732456-B21 price is $225.80, a 28% saving from the Hpe list price of $313.61. 732456-B21 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for 732456-B21 for additional pricing. Browse the full Hpe Network Adapters series or explore all Hpe products.
732456-B21 Specifications
- Power Consumption
- N/A
- Weight
- N/A
- Height
- N/A
- Depth
- N/A
- Width
- N/A
- Connector Type
- RJ-45
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Input Voltage
- 3.3V
- Max Speed
- 10Gbps
- Supported Features
- Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS
- Data Rate
- 10Gbps
- Product Type
- Network Adapter
- Adapter Type
- Ethernet
- Connection Interface
- PCIe
- Form Factor
- Internal PCIe Card
- Maximum Range
- N/A
- Bus Type
- PCIe x4
- Compatibility
- Windows, Linux, macOS
- Supported Protocols
- TCP/IP, UDP, iSCSI, NFS
- Product Name
- 732456-B21 High Performance Ethernet Adapter
732456-B21 Use Case
Virtualized Data Center Network Consolidation
In large-scale VMware ESXi clusters hosting multi-tenant workloads, the 732456-B21 HPE FlexFabric 10Gb 2-port 556FLR-SFP+ adapter consolidates traffic across two 10GbE SFP+ uplinks. This reduces physical switch port consumption by up to 40%, lowers VM network latency by 20%, and simplifies network management, delivering seamless VM mobility and scalable bandwidth in enterprise data centers.
High-Performance Compute Cluster Interconnect
For HPC environments running MPI-based simulations, the 732456-B21 adapter provides dual 10Gb SFP+ fabric ports for low-latency, high-throughput node interconnect. By enabling sub-1µs latency and hardware-offloaded packet handling, it boosts parallel compute performance by 25% and ensures deterministic data transfer for time-sensitive scientific workloads.
Accelerated SAN Connectivity for Mission-Critical Databases
In enterprise SAN deployments with HPE 3PAR storage arrays powering high-transaction SQL databases, the 732456-B21 adapter delivers Fibre Channel over Ethernet (FCoE) on dual 10Gb links. This drives a 1.5× increase in IOPS, cuts storage latency by 30%, and leverages hardware offload for secure, resilient data transport—optimizing database throughput and uptime.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| 732456-B21 |  879383-B21 |  Q6M15A |  867328-B21 |  700760-B21 | |
|---|---|---|---|---|---|
| Product Type | Network Adapter | Network Adapter | Network Adapter | Network Adapter | Network Adapter |
| Adapter Type | Ethernet | Ethernet | Ethernet | Ethernet | Ethernet |
| Data Rate | 10Gbps | 10Gbps | 10Gbps | 10Gbps | 10Gbps |
| Connection Interface | PCIe | PCIe | PCIe | PCIe | PCIe |
| Supported Protocols | TCP/IP, UDP, iSCSI, NFS | TCP/IP / UDP / iSCSI | TCP/IP, UDP | TCP/IP, UDP, iSCSI, NFS | TCP/IP, UDP |
| Form Factor | Internal PCIe Card | Internal PCIe Card | Internal PCIe Card | Internal PCIe Card | Internal PCIe Card |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Input Voltage | 3.3V | 3.3V | 3.3V | 3.3V | 3.3V |
| Compatibility | Windows, Linux, macOS | Windows / Linux / macOS | Windows, Linux, macOS | Windows, Linux, macOS | Windows, Linux, macOS |
| Max Speed | 10Gbps | 10Gbps | 10Gbps | 10Gbps | 10Gbps |
| Supported Features | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | Auto-negotiation / Wake-on-LAN / Jumbo Frames / QoS | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS | Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS |
| Power Consumption | N/A | 6W | 5W | 15W | N/A |
| Connector Type | RJ-45 | RJ-45 | RJ-45 | RJ-45 | RJ-45 |
| Maximum Range | N/A | 100 meters | 100 meters | N/A | N/A |
| Bus Type | PCIe x4 | PCIe x4 | PCIe x4 | PCIe x4 | PCIe x4 |
| Product Name | 732456-B21 High Performance Ethernet Adapter | 879383-B21 High-Performance Ethernet Adapter | Q6M15A 10Gbps PCIe Ethernet Adapter | 867328-B21 High Performance Ethernet Adapter | 700760-B21 High Performance Network Adapter |
| Height | N/A | 0.7 inches | N/A | 0.5 inches | N/A |
| Width | N/A | 3.0 inches | N/A | 3.4 inches | N/A |
| Depth | N/A | 0.5 inches | N/A | 1.2 inches | N/A |
| Weight | N/A | 0.3 lbs | N/A | 0.3 lbs | N/A |
Reviews & Ratings
H
Hamza Tariq
4
Installed without downtime.
B
Brian Lewis
5
Handles storage traffic very well.
S
Shahid Abbas
5
Consistent enterprise performance.
N
Nicolas Dupont
4
Great networking upgrade.
Questions & Answers
What is the HPE FlexFabric 10Gb 2-port 556FLR-SFP+FIO Adapter (SKU: 732456-B21)?
The HPE FlexFabric 10Gb 2-port 556FLR-SFP+FIO Adapter (732456-B21) is a low-profile, dual-port SFP+ network card designed for HPE ProLiant servers that enables 10Gb Ethernet connectivity with FlexibleLOM form factor.
Which servers are compatible with the 732456-B21 FlexFabric adapter?
This adapter is validated for HPE ProLiant Gen9 and Gen10 rack and tower servers with FlexibleLOM slots, including DL380, DL360, ML350, and BL460c models.
What port types and speeds does the 556FLR-SFP+FIO adapter support?
It features two SFP+ ports supporting 1GbE and 10GbE speeds, auto-negotiation, and full-duplex mode for optimal network performance.
What fiber transceivers are supported by the 732456-B21 adapter?
The adapter supports HPE 10Gb SFP+ optical transceivers, including SR, LR, LRM, and BiDi modules, for multi-mode and single-mode fiber applications.
What is FIO on the HPE FlexFabric adapter?
FIO (Flexible I/O) allows dynamic reconfiguration of network or storage functions via firmware, enabling on-demand provisioning of Ethernet or FCoE and iSCSI offloads.
How do I install the 556FLR-SFP+FIO adapter in my server?
Power down the server, remove the blank FlexibleLOM bracket, insert the adapter into the LOM slot, secure the bracket, and update system firmware to HPE-recommended levels.
Which operating systems are certified for this FlexFabric adapter?
Supported OS include Microsoft Windows Server, Red Hat Enterprise Linux, SUSE Linux Enterprise Server, VMware ESXi, CentOS, and Oracle Linux. Check HPE support matrix for exact versions.
Can this adapter offload virtualization traffic?
Yes. The 556FLR-SFP+FIO supports SR-IOV for hypervisor bypass, Tx/Rx checksum offload, and Jumbo Frames up to 9,000 bytes, optimizing VM network performance.
What is the maximum cable reach for 10Gb connections?
Using SFP+ SR modules on OM3/OM4 multi-mode fiber, the adapter supports up to 300 meters. With LR single-mode optics, it extends to 10 kilometers.
Does the 732456-B21 require an HPE FlexFabric license?
No additional license is required. Firmware-based FIO enables FlexFabric functions out of the box; optional HPE networking software may enhance management features.
What are the power and thermal specifications?
Typical power consumption is 6.5 W. The adapter operates between 0 °C and 55 °C at a maximum airflow of 32 CFM, matching most server cooling profiles.
How do I update firmware for the FlexFabric adapter?
Use HPE Service Pack for ProLiant (SPP) or Smart Update Manager (SUM) to apply the latest NIC firmware and device drivers, ensuring compatibility and performance.
What warranty covers the 732456-B21 adapter?
It carries HPE’s standard one-year limited warranty with worldwide support. Extended coverage is available via HPE Care Pack services.
Can I use this adapter for FCoE storage traffic?
Yes. FCoE offload is supported via FIO, enabling direct Ethernet-to-Storage traffic and reducing CPU load for converged network/storage deployments.
How does the 556FLR-SFP+FIO differ from a standard Flex-10 adapter?
Unlike Flex-10, it offers 10Gb SFP+ ports with FCoE, iSCSI offload, SR-IOV, and higher performance. Flex-10 is limited to 10GbE with FlexNIC partitioning only.
Where can I purchase the HPE FlexFabric 556FLR-SFP+FIO adapter?
Authorized HPE resellers, HPE’s online store, or your regional distributor carry SKU 732456-B21. Verify stock and pricing through official HPE channels.