Mellanox ConnectX-7 400GbE

Brand: Mellanox | Category: Network Adapters & NICs

SKU: MCX755106AS-HEAT | Part #: MCX755106AS-HEAT | MPN: MCX755106AS-HEAT

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PCIe 5.0 x16 connectivity defines the ceiling for what the Mellanox ConnectX-7 400GbE can deliver—and this adapter (part number MCX755106AS-HEAT) reaches it. With 16 lanes of fifth-generation PCI Express, you're looking at a theoretical host bandwidth of 256 Gbps per direction, enough to feed a 400 Gbps port without the bottleneck that plagued earlier-generation cards. That sustained throughput matters in data centres where every microsecond of latency or every lost packet translates to SLA violations or missed training windows in production AI workloads.

The ConnectX-7 is built for network engineers and infrastructure teams who operate at scale—those managing thousands of servers, multiple fabric tiers, or hybrid cloud environments where Ethernet, InfiniBand, and RoCE protocols all coexist. Mellanox designed this card to consolidate what used to require separate hardware: a single dual-port adapter housing one 400GbE QSFP112 port per card that can speak any of those protocols without firmware burning or hardware swaps. The MCX755106AS-HEAT variant ships with a heatspreader and passive cooling, meaning it slots into dense 1U or 2U server deployments without adding fan noise or power overhead. On-die buffering handles bursty traffic patterns that would stall lesser adapters, while the operating range of 0–50°C keeps the card stable whether it's in a chilled European data centre or sitting near a rack exhaust in a GCC facility.

For storage architects and hyperscale operators, the real value of Mellanox's ConnectX-7 line sits in its ability to saturate 400 Gbps links without CPU intervention. NVMe over Fabrics deployments, where sub-microsecond latency determines whether your storage cluster is a competitive advantage or a cost centre, depend on adapters that offload protocol processing. This card uses RDMA (Remote Direct Memory Access) and NVIDIA's SHARP collective operations to move data between servers or between server and storage without waking the CPU cores you've allocated to application logic. That architectural choice is why hyperscalers—not just vendors—standardised on ConnectX-7 for next-generation fabric refreshes. The part number MCX755106AS-HEAT appears on bill-of-materials documents at firms building out 800G-ready data centres, because even though this is a 400G card, its protocol support and buffer architecture make it future-proof when paired with the right switches.

terms follow Mellanox's lifetime hardware commitment, so long-term TCO calculations don't need to budget for mid-life replacement. The card's power envelope—sipping power through the PCIe slot rather than requiring auxiliary rails—keeps per-server infrastructure costs down in high-density deployments. That matters when you're populating rows of rack space with this adapter: ten servers with dual ports each means 20 x 400GbE uplinks, and passive cooling means no additional burden on facility CRAC units.

Reach out with your deployment topology and port count requirements via RFQ.

Interface and Performance Specifications

• PCIe 5.0 x16 host interface with 256 Gbps bidirectional bandwidth capacity
• Single 400GbE QSFP112 port per adapter; dual-port form factor for high-density server builds
• Native protocol support for Ethernet, InfiniBand, and RoCE without firmware reflashing
• On-die packet buffering and RDMA offload engine for sub-microsecond latency
• Passive heatspreader cooling, 0–50°C operating range, suitable for dense rack deployments
• Part number MCX755106AS-HEAT fits 1U and 2U server chassis without secondary power draw