What is the per-port InfiniBand line rate?

Each QSFP port delivers 40Gb/s 4X QDR InfiniBand. Note that the PCIe 2.0 x8 host link provides about 32 Gb/s of usable bandwidth, so sustained dual-port full-duplex traffic is bottlenecked by PCIe, not the wire.

Will the MHQH29B-XTR negotiate to FDR (56Gb/s) or EDR (100Gb/s)?

No. The MHQH29B-XTR is a ConnectX-2 QDR adapter and is hard-limited to 4X QDR (40Gb/s). It does not auto-negotiate to FDR, EDR, HDR, or NDR rates. For higher rates, use a ConnectX-3 FDR or newer ConnectX-5/6/7 HCA.

Is the HP 593412-001 the same card?

Yes. HP P/N 593412-001 is the OEM rebrand of the Mellanox MHQH29B-XTR; the firmware and silicon are identical. T.E.S IT-SOLUTIONS bench-tests both at https://www.tes-itsolutions.com before shipment.

Lot of 20 - NVIDIA Mellanox MHQH29B-XTR ConnectX-2 Dual-Port 4X QDR 40Gb/s InfiniBand Host Channel Adapter: This is a bulk lot of twenty (20) refurbished ConnectX-2 dual-port InfiniBand HCAs. Each card delivers 40Gb/s 4X QDR InfiniBand per port over QSFP connectors and a PCIe 2.0 x8 host interface. The MHQH29B-XTR is sold by HP under the cross-reference part number 593412-001 and is functionally identical to the Mellanox-labeled card. The R suffix denotes the tall (full-height) bracket variant. These units are refurbished.

Engineering Context

The ConnectX-2 IB silicon supports Mellanox VPI (Virtual Protocol Interconnect), allowing each port to be configured for InfiniBand QDR or 10GbE. Native InfiniBand verbs deliver low microsecond message latency for tightly-coupled HPC and storage workloads. PCIe 2.0 x8 offers 32 Gb/s of usable host bandwidth, which is below the 40Gb/s line rate per port; sustained dual-port full-duplex is bottlenecked by the PCIe link, not the wire. Hardware RDMA, GPUDirect (older flavor), and IPoIB are supported.

Deployment & Use Cases

Bulk seed hardware for legacy HPC clusters running OpenMPI or Intel MPI over InfiniBand. Lustre and GPFS storage networks. Lab and academic InfiniBand learning clusters. iSER and SRP storage initiators. Backup fabric for InfiniBand subnet manager testing. Spare-pool replenishment for existing MHQH29B-XTR fleets and HP servers using 593412-001.

Technical Specifications

OEM: Mellanox (NVIDIA Mellanox)
Part Number: MHQH29B-XTR
HP Cross-Reference: 593412-001
Controller: Mellanox ConnectX-2 IB
Ports: 2 x QSFP
Per-Port Rate: 40Gb/s 4X QDR InfiniBand
Alt Mode: 10GbE per port (VPI)
Host Interface: PCI Express 2.0 x8
RDMA: InfiniBand verbs, RoCE
Bracket: Tall (full-height)
Lot Quantity: 20 units
Condition: Refurbished - Tested by T.E.S IT-SOLUTIONS

Compatibility & Hard Constraints

Compatible with Linux mlx4 driver, Mellanox OFED stack, and Windows WinOF. Requires a QDR-capable InfiniBand switch or 10GbE switch (depending on VPI port mode). Cables (QSFP DAC or QSFP+ AOC) are sold separately. ConnectX-2 has reached end-of-support under NVIDIA; firmware updates are no longer issued. The MHQH29B-XTR will not negotiate to FDR (56Gb/s) or EDR (100Gb/s) - it is QDR-only at the wire. Modern subnet managers (UFM, OpenSM 5.x) still recognize the device but driver support requires legacy OFED on RHEL 7/8.

Why Choose T.E.S IT-SOLUTIONS

T.E.S IT-SOLUTIONS bench-tests every ConnectX-2 HCA for InfiniBand link-up at QDR speed on both ports before shipment. Browse the full refurbished networking catalog at https://www.tes-itsolutions.com. Worldwide shipping with 1-3 day handling.

Lot of 20 - NVIDIA Mellanox® MHQH29B-XTR ConnectX-2 4X QDR 40Gb/s IB HCA

Name: Lot of 20 - NVIDIA Mellanox® MHQH29B-XTR ConnectX-2 4X QDR 40Gb/s IB HCA
SKU: MHQH29B-XTR_Lot of 20_Refurbished

SKU: MHQH29B-XTR_Lot of 20_Refurbished

€300.00

Quantity