Switch Series & Supported Models
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NVIDIA/Mellanox C8240 (900-9X81Q-00CN-ST0) ConnectX®-8 InfiniBand & Ethernet SuperNIC, 400Gb/s NDR Socket-Direct, Dual-port QSFP112, PAM4 100G/lane, PCIe 6.0 x16, Tall Bracket
P/N: C8240 SKU: 11002
US$2,099.00
Nic Types:
- C8180 800G OSFP224,Single-port,PCIe 6.0 x16
- C8240 400G QSFP112,Dual-port,PCIe 6.0 x16
- C8180X PCIe Auxiliary Card Kit,PCIe 6.0 x16
Quantity:
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30-day return and refund
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3-year warranty
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Available for delivery within 2 days
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Free shipping for orders over
Products Highlight
- 400G NDR for AI Scale-Out
- Dual QSFP112 for 800G Aggregate I/O
- Socket Direct GPU-NIC Affinity
- 100G PAM4 Per-Lane Signaling
- PCIe 6.0 x16 Host Acceleration
- Native InfiniBand and Ethernet Flexibility
Specifications
| Part Number | C8240(900-9X81Q-00CN-ST0) | Adapter Card Size | HHHL |
|---|---|---|---|
| Network Connector Type | 2 × QSFP112 | Network Mode | InfiniBand: 400Gb/s NDR; Ethernet: 400GbE (Default) |
| Host Interface | PCIe 6.0 ×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 |
Applications
Certification
Features
Compare Items
| NVIDIA/Mellanox C8240 (900-9X81Q-00CN-ST0) ConnectX®-8 InfiniBand & Ethernet SuperNIC, 400Gb/s NDR Socket-Direct, Dual-port QSFP112, PAM4 100G/lane, PCIe 6.0 x16, Tall Bracket |  NVIDIA/Mellanox C8180 (900-9X81E-00EX-ST0) ConnectX®-8 InfiniBand & Ethernet SuperNIC, 800Gb/s XDR Socket-Direct, Single-port OSFP, PAM4 200G/lane, PCIe 6.0 x16, Tall Bracket | |
|---|---|---|
| Network Connector Type | 2 × QSFP112 | 1 × OSFP(RHS) |
| Network Mode | InfiniBand: 400Gb/s NDR; Ethernet: 400GbE (Default) | InfiniBand: 800Gb/s XDR (Default); Ethernet: 2 × 400GbE |
| Host Interface | PCIe 6.0 ×16 | PCIe 6.0 ×16 |
| Technology | InfiniBand: RDMA; Ethernet: RoCE | InfiniBand: RDMA; Ethernet: RoCE |
| Operating Temperature | 0°C to 55°C | 0°C to 55°C |
| Storage Temperature | -40°C to 70°C | -40°C to 70°C |
Resources
FAQ
Ask a QuestionFind answers to common questions about our products.
Does the C8240 provide one 400G port or two 400G ports?
This model uses two QSFP112 cages, with each port supporting up to 400Gb/s depending on the selected network mode. This makes it suitable for dual-link bandwidth, redundancy, or separated fabric connections.
Can the C8240 run in both NDR InfiniBand and 400GbE modes?
Yes. The C8240 supports 400Gb/s NDR InfiniBand and 400GbE Ethernet, with the actual mode determined by firmware, driver, switch port configuration, and the module or cable used.
What is the default operating mode of the C8240?
The C8240 is commonly configured with Ethernet as the default mode, with two 400GbE-capable ports. If the card is used in an InfiniBand fabric, the port mode should be verified and configured during deployment.
What is the Socket-Direct function on the C8240 ST0 used for?
Socket-Direct helps extend host-side PCIe connectivity, which is useful in multi-socket servers and bandwidth-intensive AI platforms. It helps balance traffic across the server architecture instead of forcing all NIC traffic through a single PCIe path.
What modules or cables should be paired with the C8240?
Use QSFP112 optical modules or DAC/AOC cables that match the target mode, such as NDR 400G InfiniBand or 400GbE Ethernet. Before deployment, confirm switch compatibility, port mode, cable breakout, firmware version, and airflow requirements.
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