10/16/2026
Building an AI/HPC fabric? Don’t choose by the “400G” label alone.
First confirm the fabric protocol: InfiniBand or Ethernet. Then check switch management, airflow direction and whether the server adapter matches the host and network design. A speed label by itself doesn’t guarantee that components are interchangeable.
Current NVIDIA/Mellanox networking stock:
NDR InfiniBand switches
• MQM9700-NS2F — managed, P2C airflow | 20 pcs | $29,412 each
• MQM9790-NS2F — unmanaged, P2C airflow | 10 pcs | $22,200 each
• MQM9790-NS2R — unmanaged, C2P airflow | 25 pcs | $22,945 each
ConnectX adapters
• MCX515A-CCAT | 200 pcs | $307 each
• MCX75310AAS-NEAT | 268 pcs | $1,300 each
ConnectX-8 SuperNICs
• 900-9X81Q-00CN-ST0 | 653 pcs | $1,680 each
• 900-9X81E-00EX-ST0 | 980 pcs | $1,680 each
brand new, factory sealed, genuine product.
Share the exact OPN and whether your design uses InfiniBand or Ethernet to check the right match.