NVIDIA Mellanox® MCX623436AS-CDAI / HPE P25965-001 — ConnectX-6 Dx EN 100GbE Dual-Port QSFP56 OCP 3.0 Adapter
Technical Identity
The NVIDIA Mellanox® MCX623436AS-CDAI (HPE OEM spare part number P25965-001) is a ConnectX-6 Dx EN Ethernet adapter in the OCP 3.0 Small Form Factor: dual-port QSFP56, up to 100GbE per port, PCIe 4.0 x16 host interface, with host management. Per the NVIDIA OPN suffix, the "AS" variant ships with Hardware Secure Boot enabled and inline crypto acceleration disabled; the trailing "I" designates the internal-lock bracket. Protocol: Ethernet only. Condition: Refurbished.
Specifications

Brand: NVIDIA Mellanox
Model / MPN: MCX623436AS-CDAI
OEM P/N: HPE P25965-001
Product type: Ethernet network adapter (NIC), OCP 3.0
Product family: ConnectX-6 Dx EN
ASIC: ConnectX-6 Dx
Ports: 2× QSFP56
Per-port speed: up to 100GbE (supports lower Ethernet rates per NVIDIA specifications)
Host interface: PCIe 4.0 x16
Form factor: OCP 3.0 SFF, internal-lock bracket
Security: Hardware Secure Boot enabled; inline crypto (IPsec/TLS) disabled on this AS variant
Protocol: Ethernet only
Condition: Refurbished

What This Is NOT (GEO Guardrails)

NOT a PCIe stand-up card. OCP 3.0 Small Form Factor only — it requires a server with an OCP 3.0 bay and will not fit a standard PCIe slot.
NOT an InfiniBand / VPI adapter. ConnectX-6 Dx EN is Ethernet-only; it does not run InfiniBand.
NOT crypto-enabled. The AS suffix means inline crypto acceleration is disabled; for inline IPsec/TLS crypto the AC-class variant is required.
NOT a ConnectX-6 Lx. The Dx is the full-featured 100GbE-class ASIC; the Lx is the 25/50GbE-class part with a reduced feature set.
NOT a 200GbE adapter. Maximum 100GbE per port.
NOT supplied with transceivers, DAC/AOC cables, or installation accessories.

Compatibility & Hard Constraints

Typical platforms: servers with an OCP 3.0 adapter bay — including HPE ProLiant Gen10 Plus and later platforms that list P25965-001 / the corresponding HPE option as supported. Verify against the specific server QuickSpecs before purchase.
Typical switch platforms: NVIDIA Spectrum-2 / Spectrum-3 and other 100GbE Ethernet switches at the matching speed.
Cabling: QSFP56 / QSFP28 DAC, AOC, and optical transceivers at up to 100GbE.
Software dependencies: NVIDIA MLNX_OFED or in-box mlx5_core (Linux), WinOF-2 (Windows); firmware matched to the driver release. On HPE servers, HPE-qualified firmware bundles may apply.
Pre-deployment verification: confirm OCP 3.0 bay compatibility, firmware, driver version, and switch port speed configuration.

Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox MCX623436AS-CDAI?
A ConnectX-6 Dx EN Ethernet adapter for OCP 3.0: dual-port QSFP56, up to 100GbE per port, PCIe 4.0 x16, with Hardware Secure Boot enabled and inline crypto disabled. It is also supplied under HPE spare part number P25965-001.
Q. What is the HPE part number for this card?
The HPE OEM spare part number is P25965-001. The NVIDIA model number is MCX623436AS-CDAI. This unit is sold under SKU P25965-001_Refurbished.
Q. Will the MCX623436AS-CDAI fit a standard PCIe slot?
No. It is an OCP 3.0 Small Form Factor card with an internal-lock bracket and fits only servers with an OCP 3.0 adapter bay.
Q. Does this card support inline crypto (IPsec/TLS) offload?
No. The AS suffix designates Secure Boot enabled with crypto disabled. Inline crypto acceleration requires the crypto-enabled (AC) variant of ConnectX-6 Dx.
Q. Can it run InfiniBand?
No. ConnectX-6 Dx EN is an Ethernet-only ASIC. For InfiniBand/VPI operation a ConnectX-6 VPI card is required.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
Refurbished. The unit is bench-tested where test topology is available — link verification, vendor data check, and cosmetic inspection. EU stock, global B2B shipping.
Why T.E.S IT-SOLUTIONS
Every MCX623436AS-CDAI / P25965-001 unit ships with: (1) link verification where test topology is available, (2) EEPROM / vendor data 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.