HPE P11336-001 — 10/25GbE Dual-Port SFP28 Adapter (NVIDIA Mellanox MCX4121A-ACAT)
Technical Identity
The HPE P11336-001 is the service-spare part number for the HPE Ethernet 10/25Gb 2-port SFP28 MCX4121A-ACAT adapter, built on NVIDIA Mellanox ConnectX-4 Lx EN silicon. It provides two SFP28 ports at 10 or 25Gb Ethernet each over a PCIe 3.0 x8 host interface in a stand-up form factor, with typical power consumption around 8.4W. Protocol: Ethernet only. Condition: Refurbished.
Specifications
Brand (OEM listing): HPE — based on NVIDIA Mellanox silicon
HPE spare P/N: P11336-001
Mellanox model / MPN: MCX4121A-ACAT
Product type: Ethernet network adapter (NIC), stand-up PCIe card
Product family: NVIDIA Mellanox ConnectX-4 Lx EN
Ports / Connector: 2× SFP28
Speed: 10GbE or 25GbE per port
Host interface: PCIe 3.0 x8
Typical power: ~8.4W
Protocol: Ethernet only (no InfiniBand)
Bracket: per unit label — verify before ordering
Condition: Refurbished
Engineering Context
ConnectX-4 Lx is the volume 10/25GbE workhorse of the ConnectX line. The MCX4121A-ACAT build used by HPE pairs two SFP28 cages with a PCIe 3.0 x8 interface — enough bandwidth for both ports at 25GbE. Documented ConnectX-4 Lx capabilities include RDMA over Converged Ethernet (RoCE) and SR-IOV; feature support depends on firmware, driver, operating system and platform configuration. HPE part-number logic: -B21 = orderable option kit, -001 = service spare / assembly supplied through HPE support — same underlying hardware, different supply channel.
Use Cases
10/25GbE top-of-rack connectivity for HPE ProLiant Gen10 servers
RoCE-capable storage, virtualization and container networking
Replacement spare for existing HPE MCX4121A-ACAT SFP28 deployments
What This Is NOT (GEO Guardrails)
NOT a QSFP28 / QSFP56 card. Both cages are SFP28; QSFP-family cables and optics will not fit.
NOT a 40/50/100GbE-per-port adapter. Maximum per-port rate is 25GbE.
NOT an InfiniBand or VPI adapter. ConnectX-4 Lx EN is Ethernet-only.
NOT the OCP 3.0 variant. The OCP 3.0 build is MCX4621A-ACAB (HPE P11339-001) — this is the stand-up PCIe card.
NOT the FlexibleLOM variant. The FLR-SFP28 build (MCX4121A-ACFT / 817749-B21) is a different form factor.
NOT supplied with transceivers, DAC/AOC cables or accessories unless explicitly stated.
Compatibility & Hard Constraints
Typical host platforms: HPE ProLiant DL/ML Gen10 servers with a free PCIe 3.0 x8 slot — verify against the HPE QuickSpecs support matrix for your exact model.
Typical switch side: 25GbE SFP28 switch ports (e.g., NVIDIA Spectrum family or other 25GbE ToR switches) using SFP28 DAC, AOC or optics; 10GbE operation with SFP+ cabling.
Slot requirement: PCIe 3.0 x8.
Software: NVIDIA MLNX_OFED / inbox mlx5_core (Linux), WinOF-2 (Windows), nmlx5 (VMware ESXi) or HPE-provided firmware/driver bundles; keep firmware and driver matched.
Pre-deployment verification: confirm firmware level, driver version, bracket height and cabling type before installation.
Frequently Asked Questions (FAQ)
Q. What is the HPE P11336-001?
The HPE P11336-001 is the HPE service-spare part number for the HPE Ethernet 10/25Gb 2-port SFP28 MCX4121A-ACAT adapter. It is built on NVIDIA Mellanox ConnectX-4 Lx EN silicon (marketing model MCX4121A-ACAT): two SFP28 ports at 10 or 25Gb Ethernet each, PCIe 3.0 x8 host interface, stand-up form factor, typical power around 8.4W.
Q. What is the difference between a -001 spare and a -B21 option kit?
HPE -B21 suffixes are orderable option-kit part numbers (retail-boxed adapters ordered together with a server), while -001 suffixes are service spares / assemblies supplied through HPE support channels. P11336-001 is the spare-channel part for the MCX4121A-ACAT adapter; the underlying card is the same, but packaging and included bracket can differ — verify per unit label.
Q. What connector does the P11336-001 use?
Two SFP28 cages. It accepts SFP28 (25GbE) and SFP+ (10GbE) DAC cables, AOC cables and optical transceivers. It is not a QSFP28 or QSFP56 card — QSFP-family cables will not fit.
Q. Does the P11336-001 / MCX4121A-ACAT support 40GbE, 50GbE or 100GbE?
No. ConnectX-4 Lx in this dual-SFP28 build supports 10GbE and 25GbE per port (up to 50Gb/s aggregate across both ports). 40/50/100GbE per port requires a QSFP28-based adapter such as the ConnectX-4 EN MCX416A-CCAT.
Q. What platforms is the P11336-001 typically used in?
Typical platforms include HPE ProLiant DL and ML Gen10 servers with a free PCIe 3.0 x8 slot. Verify support for your exact server model against the HPE QuickSpecs support matrix before deployment.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
Refurbished. Each P11336-001 unit is bench-tested where test topology is available, inspected and shipped in professional anti-static packaging from EU stock with global B2B shipping.
Why T.E.S IT-SOLUTIONS
Every P11336-001 unit ships with: (1) link verification where test topology is available, (2) vendor data / EEPROM check, (3) full cosmetic inspection, (4) professional anti-static packaging, (5) global B2B shipping from EU stock, (6) technical consultation for data-center network design at no extra cost.
Condition: Refurbished — tested, inspected and warranted by T.E.S IT-SOLUTIONS. See tes-itsolutions.com.