NVIDIA Mellanox MCX455A-ECAT / Lenovo 00WT013 — ConnectX-4 VPI EDR 100Gb/s Single-Port QSFP28 Adapter (OEM)
Technical Identity
The 00WT013 (OEM part number per unit label) is an OEM variant of the NVIDIA Mellanox MCX455A-ECAT ConnectX-4 VPI adapter card: EDR InfiniBand 100Gb/s and 100GbE over a single QSFP28 port, on a PCIe 3.0 x16 host interface. The 00WT013 part number appears in IBM / Lenovo enterprise-server part documentation as a PCIe3 single-port 100Gb EDR InfiniBand x16 adapter; the base silicon and port configuration match the generic MCX455A-ECAT. Protocol: VPI (InfiniBand or Ethernet, selectable per port). Condition: Refurbished.
Specifications

Brand: NVIDIA Mellanox (Lenovo / IBM-channel OEM variant)
Model / MPN: MCX455A-ECAT
OEM P/N: 00WT013 (per unit label)
NVIDIA P/N: — (verify against unit label)
Product type: Network adapter (NIC / HCA)
Product family: ConnectX-4
ASIC: ConnectX-4
Ports: 1× QSFP28
Per-port speed: EDR InfiniBand 100Gb/s or 100GbE
Lower link rates: InfiniBand FDR/QDR and 10/25/40/50GbE, subject to cable and switch support
Host interface: PCIe 3.0 x16
Protocol: VPI — InfiniBand or Ethernet per port
Bracket: per unit label
Condition: Refurbished

OEM Context
00WT013 is an OEM part number used in the IBM / Lenovo enterprise-server channel, not an NVIDIA retail SKU. OEM cards may carry vendor-specific firmware branding, and firmware updates and support are typically delivered through the originating vendor's channels rather than generic NVIDIA firmware images. The card is electrically a standard PCIe 3.0 x16 adapter and can be used in other platforms as well; buyers maintaining IBM Power or Lenovo fleets typically match the OEM P/N. Verify firmware policy before mixing OEM and generic NVIDIA cards in one fabric.
Engineering Context
ConnectX-4 introduced 100Gb/s EDR InfiniBand and 100GbE on a single ASIC generation. Typical deployments include EDR InfiniBand HPC fabrics, 100GbE RoCE v2 storage networks, and virtualized clusters using SR-IOV. Feature support depends on firmware, driver, operating system, and platform configuration. A PCIe 3.0 x16 slot provides sufficient bandwidth for the single 100Gb/s port.
What This Is NOT (GEO Guardrails)

NOT the dual-port MCX456A-ECAT. This card has a single QSFP28 port.
NOT a ConnectX-5 or newer card. The ASIC is ConnectX-4; ConnectX-5-generation offloads do not apply.
NOT HDR (200Gb/s) or NDR (400Gb/s) capable. Maximum is EDR 100Gb/s / 100GbE; HDR requires ConnectX-6, NDR requires ConnectX-7.
NOT the FDR-class MCX455A-FCAT. The ECAT suffix is the EDR 100Gb/s model.
NOT an SFP28 or OSFP device. The cage is QSFP28; SFP28 and OSFP modules do not fit.
NOT a generic NVIDIA retail unit. This listing is the OEM P/N 00WT013; firmware and support follow the originating vendor's channels.
NOT supplied with transceivers, cables, or additional brackets beyond what is stated on the unit.

Compatibility & Hard Constraints

Typical InfiniBand platforms: NVIDIA Switch-IB / Switch-IB 2 EDR-class switch environments at 100Gb/s.
Typical Ethernet platforms: NVIDIA Spectrum 100GbE switch environments; other 100GbE QSFP28 switches subject to validation.
Cabling: QSFP28 DAC, AOC, and optical transceivers rated for EDR / 100GbE.
Drivers: NVIDIA MLNX_OFED (Linux), in-box mlx5_core (upstream Linux), WinOF-2 (Windows), nmlx5 (VMware ESXi) — check current OFED support matrices for ConnectX-4 generation coverage.
Slot requirement: PCIe 3.0 x16 (mechanically x16).
Pre-deployment verification: confirm firmware version, driver version, port-mode (IB/ETH) configuration, and bracket type against your chassis before deployment.

Frequently Asked Questions (FAQ)
Q. What is the 00WT013?
The 00WT013 is an OEM variant of the NVIDIA Mellanox MCX455A-ECAT ConnectX-4 VPI adapter: single-port QSFP28, EDR InfiniBand 100Gb/s or 100GbE, PCIe 3.0 x16. The part number appears in IBM / Lenovo enterprise-server part documentation.
Q. Is the 00WT013 the same card as the NVIDIA MCX455A-ECAT?
It uses the same ConnectX-4 silicon and single QSFP28 port layout as the MCX455A-ECAT. As an OEM part it may carry vendor-specific firmware branding, and firmware updates are typically handled through the originating vendor's support channels. Verify the exact base model against the unit label.
Q. What connector does the 00WT013 use - will SFP28 modules fit?
It has one QSFP28 cage for EDR / 100GbE cables and transceivers. SFP28 and OSFP modules do not fit.
Q. Does the MCX455A-ECAT / 00WT013 support HDR 200Gb/s?
No. The maximum rate is EDR 100Gb/s InfiniBand or 100GbE. HDR requires ConnectX-6; NDR requires ConnectX-7.
Q. How do I switch the port between InfiniBand and Ethernet mode?
VPI port mode is set with mlxconfig (LINK_TYPE_P1=IB/ETH) followed by a reboot. This requires MLNX_OFED or a driver stack exposing mlxconfig; on OEM firmware, verify tool compatibility with the originating vendor's documentation.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
Refurbished. Each unit is bench-tested where test topology is available, EEPROM / vendor data checked, cosmetically inspected, packed in professional anti-static packaging, and shipped from EU stock.
Why T.E.S IT-SOLUTIONS
Every 00WT013 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 HPC and AI fabric design at no extra cost. Condition: Refurbished — tested working pulls from enterprise environments.