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NVIDIA MCX556A-ECAT ConnectX-5 100Gb/s VPI adapter card with dual QSFP28 ports and PCIe 3.0 x16 interface

NVIDIA/Mellanox MCX556A-ECAT Mellanox ConnectX®-5 VPI Adapter Card, EDR IB (100Gb/s) and 100GbE, Dual-port QSFP28, PCIe 3.0×16, Tall Bracket

P/N: MCX556A-ECAT SKU: 11502

US$529.00

In Stock: 143 pcs

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Products Highlight

  • Dual 100G Ports for Multi-Rail Fabrics
  • 200G Aggregate for Distributed Training
  • EDR InfiniBand for MPI Clusters
  • Ethernet Mode for Storage Convergence
  • RoCE and GPUDirect for Fast Data Paths
  • PCIe Gen3 for Server Refresh Projects

Specifications

Part Number MCX556A-ECAT(900-9X5AD-0056-ST8) Adapter Card Size HHHL
Network Connector Type 2 × QSFP28 Network Mode InfiniBand: EDR (100Gb/s); Ethernet: 100GbE
Host Interface PCIe 3.0 ×16 Technology InfiniBand: RDMA; Ethernet: RoCE
Operating Temperature 0°C to 55°C Storage Temperature -40°C to 70°C
Environmental Compliance RoHS Compliant Warranty 1-Year / 3-Year / 5-Year Support Options Available

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NVIDIA/Mellanox MCX556A-ECAT Mellanox ConnectX®-5 VPI Adapter Card, EDR IB (100Gb/s) and 100GbE, Dual-port QSFP28, PCIe 3.0x16, Tall BracketNVIDIA/Mellanox MCX556A-ECAT Mellanox ConnectX®-5 VPI Adapter Card, EDR IB (100Gb/s) and 100GbE, Dual-port QSFP28, PCIe 3.0x16, Tall BracketNVIDIA/Mellanox MCX555A-ECAT Mellanox ConnectX®-5 VPI Adapter Card, EDR IB (100Gb/s) and 100GbE, Single-port QSFP28, PCIe 3.0x16, Tall BracketNVIDIA/Mellanox MCX555A-ECAT Mellanox ConnectX®-5 VPI Adapter Card, EDR IB (100Gb/s) and 100GbE, Single-port QSFP28, PCIe 3.0x16, Tall BracketNVIDIA/Mellanox MCX515A-CCAT Mellanox ConnectX®-5 EN Network Interface Card, 100GbE Single-port QSFP28, PCIe Gen 3.0x16, Tall BracketNVIDIA/Mellanox MCX515A-CCAT Mellanox ConnectX®-5 EN Network Interface Card, 100GbE Single-port QSFP28, PCIe Gen 3.0x16, Tall BracketNVIDIA/Mellanox MCX516A-CCAT Mellanox ConnectX®-5 EN Network Interface Card, 100GbE Dual-port QSFP28, PCIe Gen 3.0x16, Tall BracketNVIDIA/Mellanox MCX516A-CCAT Mellanox ConnectX®-5 EN Network Interface Card, 100GbE Dual-port QSFP28, PCIe Gen 3.0x16, Tall Bracket
Network Connector Type2 × QSFP281 × QSFP281 × QSFP282 × QSFP28
Network ModeInfiniBand: EDR (100Gb/s); Ethernet: 100GbEInfiniBand: EDR (100Gb/s); Ethernet: 100GbEEthernet: 1/10/25/40/50/100GbEEthernet: 1/10/25/40/50/100GbE
Host InterfacePCIe 3.0 ×16PCIe 3.0 ×16PCIe 3.0 ×16PCIe 3.0 ×16
TechnologyInfiniBand: RDMA; Ethernet: RoCEInfiniBand: RDMA; Ethernet: RoCEEthernet: RoCEEthernet: RoCE
Operating Temperature0°C to 55°C0°C to 55°C0°C to 55°C0°C to 55°C
Storage Temperature-40°C to 70°C-40°C to 70°C-40°C to 70°C-40°C to 70°C

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Find answers to common questions about our products.

How is MCX555A-ECAT different from MCX556A-ECAT?

MCX555A-ECAT is the single-port QSFP28 version, while MCX556A-ECAT is the dual-port QSFP28 version. Both are ConnectX-5 VPI cards for EDR IB and 100GbE, but MCX555A-ECAT is intended for one 100G-class server link.

Can both ports deliver full 100G traffic through PCIe Gen3 x16 at the same time?

This is the main limitation to check. NVIDIA specifies that PCIe Gen3 x16 provides a maximum bus bandwidth of 128Gb/s, so the dual-port MCX556A-ECAT cannot provide a full 200Gb/s aggregate host path when both ports are fully loaded.

Why would an EDR cluster use a dual-port VPI card instead of two single-port cards?

A dual-port adapter is useful for dual-rail InfiniBand, fabric redundancy, or separating storage and compute traffic while keeping one PCIe slot. It can simplify server layout when the platform has limited PCIe slots.

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