What is the networking speed and port configuration of the HPE P25961-B21 adapter?

The HPE P25961-B21 is categorized as a 2-port 100GbE QSFP28 Ethernet adapter. This means it provides two Ethernet ports, each operating at 100GbE, allowing servers to connect to high-speed network infrastructure. The dual-port design supports scenarios where multiple 100GbE links per host are required.

Which connector type is used on the HPE Ethernet 100Gb QSFP28 MCX623106AS-CDAT PCIe Adapter?

This adapter uses QSFP28 connectors for its Ethernet interfaces, as indicated by its designation as an Ethernet 100Gb QSFP28 adapter and 2-port 100GbE QSFP28 network adapter. QSFP28 is a common interface for 100GbE links, aligning with standard transceivers and cabling used in many data centers.

What bus interface does the HPE P25961-B21 network adapter require in the host server?

The adapter is defined as a PCI Express 4.0 x16 Ethernet adapter, meaning it is intended for installation in a PCIe 4.0 x16 slot. This bus interface provides the electrical and mechanical connection to the host and is important for ensuring compatibility with the server’s available PCIe slots.

What type of product is the HPE P25961-B21 in server configurations?

The HPE P25961-B21 is a network adapter, specifically an Ethernet 100Gb QSFP28 MCX623106AS-CDAT PCIe Adapter. It functions as a plug-in PCIe card that adds 2-port 100GbE QSFP28 connectivity to a server platform, enabling high-speed Ethernet networking through a PCIe 4.0 x16 expansion slot.

How should IT teams identify this adapter in procurement and documentation?

IT teams should reference it by its brand and SKU, HPE P25961-B21, and by its description as an Ethernet 100Gb QSFP28 MCX623106AS-CDAT PCIe Adapter. Including its classification as a PCI Express 4.0 x16 2-port 100GbE QSFP28 network adapter helps avoid confusion with other Ethernet or PCIe cards.

P25961-B21 - HPE P25961-B21 2-port 100GbE QSFP28 network adapter

Name: HPE P25961-B21 2-port 100GbE QSFP28 network adapter
Brand: HPE
SKU: P25961-B21
Price: 1035 USD
Availability: InStock

P25961-B21 - HPE P25961-B21 2-port 100GbE QSFP28 network adapter | US IT Hardware

Product overview

The HPE Ethernet 100Gb QSFP28 MCX623106AS-CDAT PCIe Adapter P25961-B21 is a dual-port 100GbE solution for high-bandwidth network connectivity. Classified as a PCI Express 4.0 x16 Ethernet adapter, it is designed for environments that require 2-port 100GbE QSFP28 interfaces. This network adapter leverages PCIe 4.0 x16 to provide a high-performance bus connection to the host system, supporting demanding data transfer requirements. With 2-port 100GbE QSFP28 connectivity, it aligns with modern data center architectures that standardize on 100GbE links. As a network adapter in plug-in PCIe form, it fits standard server expansion workflows and can be evaluated by procurement teams based on its interface type and port configuration. The model designation Ethernet 100Gb QSFP28 MCX623106AS-CDAT PCIe Adapter clearly identifies its Ethernet focus, 100Gb capability, QSFP28 port type, and PCIe attachment.

HPE P25961-B21 dual-port 100GbE network adapter
2-port 100GbE configuration for high-bandwidth links
QSFP28 interfaces for 100GbE connectivity
PCI Express 4.0 x16 Ethernet adapter form factor
Ethernet 100Gb QSFP28 MCX623106AS-CDAT model
Designed as a plug-in PCIe network adapter

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Refunds within 14 days and replacements within 30 days of delivery with an RMA (25% restocking fee on customer-initiated returns), and every part carries our Standard 30-Day Warranty - see our return policy or contact US IT Hardware.

Featuring

Manufacturer part #	P25961-B21
Brand	HPE
Condition	New
Model	Ethernet 100GB QSFP28 MCX623106AS-CDAT PCIe Adapter
Series	MCX623106AS-CDAT Ethernet 100Gb Adapter for HPE
Part Class	MCX623106AS-CDAT
Form Factor	Plug-in card
Product Line	Ethernet 100Gb PCIe Adapter
Product Type	Network Adapter
ASIC / Controller	Mellanox MCX623106AS-CDAT (ConnectX-6 Dx EN controller)
Maximum Data Rate	200 Gbps

Compatible systems

No explicit system or OS compatibility information was found for P25961-B21.

Best for

Data center 100GbE connectivity
Suitable for environments standardizing on 100GbE, using its 2-port 100GbE QSFP28 design to connect servers to high-speed aggregation or spine layers.
High-throughput servers
A fit for servers that require PCI Express 4.0 x16 Ethernet adapters to handle intensive network traffic and large data flows at 100Gb speeds.
QSFP28-based network fabrics
Designed for infrastructures built around QSFP28 optics and cables, using its 2-port 100GbE QSFP28 interfaces to integrate cleanly into existing fabrics.
Consolidated network interfaces
Useful where dual 100GbE ports on a single PCIe 4.0 x16 adapter can consolidate multiple lower-speed connections into fewer, higher-bandwidth links.
HPE server expansions
Intended for HPE platforms needing an Ethernet 100Gb QSFP28 MCX623106AS-CDAT PCIe Adapter that occupies a PCI Express 4.0 x16 slot with dual 100GbE ports.

Frequently asked questions

Details

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Security Features	Hardware root of trust and secure boot support to help protect adapter firmware and boot process

Target Application	High-performance Ethernet connectivity for HPE ProLiant and other HPE servers in data center and enterprise environments

Card Type / Profile	Stand-up PCIe adapter card

Compatibility Notes	Designed for use with selected HPE ProLiant Gen10 Plus and Gen11 servers

Connectivity Technology	Wired

PCI Specification Revision	PCIe 4.0

Supported Virtualization / Offload Features	RDMA support, RDMA over Converged Ethernet (RoCE and RoCE v2), iWARP support, Single Root I/O Virtualization (SR-IOV), Receive Side Scaling (RSS), VMware NetQueue, Microsoft Virtual Machine Queue (VMQ), tunnel offload, GENEVE support, VXLAN, NVGRE

Performance

Throughput Capability	Up to 200 Gbps aggregate data throughput across dual 100GbE ports (100 Gbps per port)
Operational Features for Low Latency	Advanced RDMA capabilities and Data Plane Development Kit (DPDK) support for low-latency, high-throughput networking

Typical Power Consumption	13 W (operational)

Networking Ports & Interfaces

Ports	2 x 100GbE QSFP28
Port Type	QSFP56 (backward compatible with QSFP28 optics or DACs for 100GbE operation)
Bus Interface	PCI Express 4.0 x16
Ports (Count)	2 ports
Connector Type	QSFP28
Interface Type	PCIe 4.0 x16 host interface
Data Link Protocol	100 Gigabit Ethernet
Port Configuration	Dual 100 Gigabit QSFP28
Network Adapter Type	Dual-port 100 Gigabit Ethernet adapter
Host Interface Standard	PCI Express 4.0
Management and Offload Capabilities	Supports Data Plane Development Kit (DPDK), Receive Side Scaling (RSS), PXE, SR-IOV, and hardware offloads for tunneling protocols
Supported Ethernet Standards / Speeds	1GbE, 10GbE, 25GbE, 40GbE, 50GbE, 100GbE (depending on transceiver or cable used)
Network / Transport Protocols Supported	iSCSI, IPv4, IPv6
Advanced Network Virtualization Features	Virtual Extensible LAN (VXLAN), Network Virtualization using Generic Routing Encapsulation (NVGRE), GENEVE tunnel offload

HPE P25961-B21 2-port 100GbE QSFP28 network adapter