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Kevin Moore
5
SFP+ adapter provided low latency and stability.
732456-B21
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HPE FlexFbr 10Gb 2P 556FLR-SFP+FIO Adptr
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732456-B21
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- HPE FlexFbr 10Gb 2P 556FLR-SFP+FIO Adptr
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- List 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
- Product Type
- Network Adapter
- Adapter Type
- Ethernet
- Data Rate
- 10Gbps
- Connection Interface
- PCIe
- Supported Protocols
- TCP/IP, UDP, iSCSI, NFS
- Form Factor
- Internal PCIe Card
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Input Voltage
- 3.3V
- Compatibility
- Windows, Linux, macOS
- Max Speed
- 10Gbps
- Supported Features
- Auto-negotiation, Wake-on-LAN, Jumbo Frames, QoS
- Power Consumption
- N/A
- Connector Type
- RJ-45
- Maximum Range
- N/A
- Bus Type
- PCIe x4
- Product Name
- 732456-B21 High Performance Ethernet Adapter
- Height
- N/A
- Width
- N/A
- Depth
- N/A
- Weight
- N/A
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.