NVIDIA Mellanox® MHQH19B-XTR — ConnectX-2 VPI Single-Port QSFP Adapter

Technical Identity
The NVIDIA Mellanox® MHQH19B-XTR is a ConnectX-2 VPI (Virtual Protocol Interconnect) single-port PCIe adapter card with a QSFP cage. It supports up to 40 Gb/s InfiniBand QDR and 10 Gigabit Ethernet on the same physical port — software-selectable per port. Host interface is PCIe 2.0 x8 (5.0 GT/s). Refurbished Grade A, bench-tested by T.E.S IT-SOLUTIONS.

Specifications

OEM: NVIDIA Mellanox
Part Number (MPN): MHQH19B-XTR
Family / ASIC: ConnectX-2 (MT26428)
Port Configuration: Single-Port
Connector: QSFP
InfiniBand Speeds: SDR / DDR / QDR (up to 40 Gb/s)
Ethernet Speed: 10 GbE
Protocol: VPI dual-protocol — Ethernet or InfiniBand, software-selectable per port
Host Interface: PCIe 2.0 x8 (5.0 GT/s)
Bracket: Standard / short bracket
Condition: Refurbished Grade A — bench-tested by T.E.S IT-SOLUTIONS


What This Is NOT

NOT a switch. This is a host-side PCIe adapter card and requires a server PCIe 2.0 (or backward-compatible) slot.
NOT a 40GbE adapter. In Ethernet mode this card runs at 10 GbE only. The 40 Gb/s rating refers to InfiniBand QDR speed.
NOT a newer ConnectX generation. This is ConnectX-2 (MT26428). Drivers, firmware, and feature sets differ from ConnectX-3, ConnectX-4, ConnectX-5, ConnectX-6, and ConnectX-7.
NOT Ethernet-only or InfiniBand-only. VPI dual-protocol — each port is software-selectable between Ethernet and InfiniBand modes.
NOT bundled with cables, transceivers, or a low-profile bracket.


Compatibility & Constraints

Drivers: ConnectX-2 uses the mlx4 driver stack, not mlx5. NVIDIA MLNX_OFED legacy / LTS branch (Linux), in-box mlx4_core / mlx4_en / mlx4_ib (upstream Linux), WinOF (Windows), nmlx4_* (older VMware ESXi).
Mode switching: use connectx_port_config from MLNX_OFED or mstconfig -d <device> set LINK_TYPE_P1=<ETH|IB|AUTO>, then reload the driver.
Cabling: QSFP (not QSFP+) — passive copper DACs, AOCs, or 40G IB QDR transceivers in the QSFP form factor. For 10GbE host-side use, QSA (QSFP-to-SFP+) adapters are an option.
Compatible switches (IB mode): Mellanox InfiniScale-IV / IS5000-series QDR switches, SwitchX / SwitchX-2 operating in QDR mode.
Compatible switches (ETH mode): 10GbE switches supporting QSFP, or any 10GbE switch via QSA adapters.
Lifecycle note: ConnectX-2 is end-of-life from NVIDIA. Current OFED branches may not include this generation — use the legacy / LTS OFED release for production support.


Deployment & Use Cases

Legacy HPC clusters running QDR InfiniBand fabrics.
Lab and development environments needing affordable IB QDR endpoints.
Cost-effective 10GbE host connectivity in older PCIe 2.0 servers.
RDMA / storage protocol benchmarking on legacy hardware.
Rebuild or spare unit for existing ConnectX-2 deployments.


FAQ
Q: What is the NVIDIA Mellanox MHQH19B-XTR?
A: A ConnectX-2 VPI single-port QSFP adapter card supporting up to 40 Gb/s InfiniBand QDR and 10 Gigabit Ethernet, software-selectable per port. PCIe 2.0 x8 host interface.

Q: Does the MHQH19B-XTR support 40GbE Ethernet?
A: No. In Ethernet mode this card runs at 10 GbE only. The 40 Gb/s rating refers to InfiniBand QDR speed, not Ethernet.

Q: How do I switch a port between Ethernet and InfiniBand mode?
A: On ConnectX-2 use the MLNX_OFED connectx_port_config utility, or mstconfig -d <device> set LINK_TYPE_P1=<ETH|IB|AUTO>, then reload the mlx4 driver.

Q: What switches and cables are compatible with MHQH19B-XTR?
A: InfiniBand mode pairs with Mellanox QDR switches (InfiniScale-IV / IS5000 series, SwitchX-2 in QDR mode). Ethernet mode pairs with any 10GbE switch supporting QSFP, or via QSA adapters. Cabling: QSFP DACs, AOCs, or transceivers — not QSFP+.

Q: What is the condition of this unit?
A: Refurbished Grade A. Bench-tested by T.E.S IT-SOLUTIONS with link establishment validation, port traffic checks, and cosmetic inspection. Anti-static packaging, EU stock.

Why T.E.S IT-SOLUTIONS
Every MHQH19B-XTR is bench-tested by T.E.S IT-SOLUTIONS: link establishment, port-by-port traffic validation, and full cosmetic inspection. Professional anti-static packaging, global B2B shipping from EU stock, and technical consultation for legacy HPC, lab, and 10GbE-host deployments. See tes-itsolutions.com.