We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Green printed circuit board with a single QSFP port and silver PCIe 2.0 x8 edge connector

Mellanox Technologies

Mellanox Technologies MHQH19B-XTR 40Gbps PCIe 2.0 x8 network card

SKU CH-44NF-R6FXY MPN MHQH19B-XTR

A 40Gbps InfiniBand host bus adapter with one QSFP port on a PCIe 2.0 x8 interface

  • StandardsIEEE 802.1Q, IEEE 802.1p
  • Speed40Gbps
  • InterfacePCI Express 2.0 x8
  • FeaturesProduct Name: HQH19B-XTR Infiniband Host Bus Adapter Product
  • 40 Gbps throughput for high-bandwidth workloads
  • PCI Express 2.0 x8 host interface for server compatibility
  • Single QSFP port enables 40 Gbps connectivity
  • Supports IEEE 802.1Q and 802.1p for traffic management
  • Infiniband host bus adapter with Fibre Channel capability

40Gbps Infiniband Adapter

The Mellanox MHQH19B-XTR is a single-port Infiniband host bus adapter delivering 40Gbps throughput over a PCI Express 2.0 x8 slot. It targets datacentre operators and HPC clusters that need deterministic, high-bandwidth fabric connectivity for compute or storage workloads.

Sustained Fabric Throughput

The ConnectX-2 VPI engine maintains line-rate 40Gbps across extended transfers, avoiding the throughput collapse seen in burst-only designs. IEEE 802.1Q and 802.1p support preserves traffic-class separation so storage and MPI streams stay isolated under continuous load.

QSFP Port and Half-Height Bracket

A single QSFP cage accepts direct-attach copper or optical modules, letting the same card serve short rack runs or longer inter-row links. The low-profile bracket fits dense 1U servers, while the x8 edge connector ensures compatibility with legacy PCIe 2.0 backplanes still common in appliance refresh cycles.

Highlights

  • 40 Gbps throughput for high-bandwidth workloads
  • PCI Express 2.0 x8 host interface for server compatibility
  • Single QSFP port enables 40 Gbps connectivity
  • Supports IEEE 802.1Q and 802.1p for traffic management
  • Infiniband host bus adapter with Fibre Channel capability

Specifications

BrandMellanox
ModelMHQH19B-XTR
StandardsIEEE 802.1Q, IEEE 802.1p
Speed40Gbps
InterfacePCI Express 2.0 x8
FeaturesProduct Name: HQH19B-XTR Infiniband Host Bus Adapter
Product Type: Infiniband Host Bus Adapter
Ports/Channels: 1 x Fibre Channel
Host Interface: PCIe 2.0 x8
Expansion Slots Total (Free): 1 QSFP
Data Transfer Rate: 40 Gbps
Shipping weight0.45 kg
Package size221 × 173 × 53 mm

Questions about this item

Does the MHQH19B-XTR need active cooling to sustain 40Gbps all day?

The card is a passive ConnectX-2 VPI adapter; it relies on chassis airflow through the PCIe 2.0 x8 slot and has no onboard fan.

What cable or module must I already own to use the single QSFP port?

You need a QSFP+ transceiver or direct-attach cable rated for 40Gbps InfiniBand or Fibre Channel that matches your link distance.

Will this PCIe 2.0 x8 card work in my older server that only has PCIe 1.1 x8 slots?

Yes — the interface is backward compatible, so the card will negotiate down to PCIe 1.1 x8 bandwidth while still presenting the 40Gbps QSFP port.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.