Specifications
Confirm model, interface type, rate, power, airflow and software version before ordering.
Selection answer
MCX653105A-HDAT is a single-port ConnectX-6 VPI adapter whose retained specification lists InfiniBand through HDR100 and Ethernet rates through 100GbE. It is the focused option in this group when one QSFP56 network port matches the topology. Selection still depends on the server slot, supported firmware, operating system, cable or optic and the target network mode.
Retained specification and decision evidence
| Decision area | Retained record | Evidence to collect |
|---|---|---|
| Complete OPN | MCX653105A-HDAT | Quote, package label and installed-device inventory match exactly |
| Network interface | One QSFP56 port | Topology needs one host-facing link and has a defined recovery path |
| Listed modes | HDR100 through SDR; Ethernet through 100GbE | Switch port, media, firmware and configuration support the selected mode |
| Host interface | PCIe 3.0/4.0 x16; 16.0 GT/s is stated | Server slot generation, width, lane sharing and BIOS settings are checked |
| Adapter family | ConnectX-6 VPI with RDMA support stated | Required driver, RDMA stack and operating-system matrix are approved |
Suitable and unsuitable scenarios
- Suitable for evaluation: a server needs one HDR100 or up-to-100GbE link and has a compatible x16 slot, supported software and verified QSFP56 media.
- Validate before selection: the host shares PCIe lanes, mixes adapter generations, uses virtualization or requires a particular RDMA and storage-offload stack.
- Not the direct fit: the design needs two physical network ports on one adapter, HDR or 200GbE operation, or has not defined link redundancy.
Single-port versus dual-port decision
The single-port MCX653105A-HDAT avoids paying for an unused second interface in a topology that genuinely needs one link. The MCX653106A-HDAT records in this group list two QSFP56 ports and higher HDR or 200GbE modes, but those differences do not make them automatic replacements. Compare physical port count, required line rate, PCIe capacity, failure domains, slot availability and the validated media matrix.
Procurement checks
- Record the full server model, CPU placement, slot generation, electrical width and lane-sharing rules.
- State whether the link will use InfiniBand HDR100 or an Ethernet rate through 100GbE.
- List the switch port, complete cable or transceiver OPN, connector and supported distance.
- Confirm driver, firmware, operating system, RDMA stack and management-tool versions.
- Keep
MCX653105A-HDATunchanged on the bill of materials and acceptance record.
Acceptance test path
- Verify the PCIe generation and negotiated width after installation.
- Confirm firmware, driver and adapter identity against the approved build sheet.
- Check link mode, negotiated rate, FEC where applicable, error counters and RDMA operation.
- Run representative traffic, reboot and link-recovery tests, then retain the results with the endpoint and media matrix.
FAQ
Does QSFP56 mean this adapter should be ordered for 200GbE?
No. The retained model parameters for MCX653105A-HDAT list Ethernet through 100GbE and InfiniBand through HDR100. Connector form alone does not establish the supported rate.
Can a PCIe 3.0 x16 server be accepted without testing?
No. PCIe 3.0 support is listed, but the actual slot width, lane sharing, BIOS, firmware and workload must be verified on the target server.
Does stated RDMA support confirm every software stack?
No. Confirm the required protocol, driver, operating system, firmware and application integration as one tested combination.
Evidence boundary: This page uses the model, port, rate, PCIe, family and RDMA values retained in the existing record. It does not confirm price, stock, delivery, authorization, certification, warranty, current lifecycle, universal compatibility or performance gains.
Compare the ConnectX adapter catalog, review AI and data-center network designs, inspect deployment case contexts, and document the host and media matrix in the enterprise buyer guide.
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