Product reference illustration, not a photograph of the offered stock. Connector, cooling and length variants are defined by the exact part number.

1 / 2

NETWORK ADAPTER

C8240

NVIDIA NVIDIA ConnectX-8 C8240 900-9X81Q-00CN-ST0 400GbE / 400Gb/s HHHL Network Adapter

P/N:C8240NVIDIA OPN: 900-9X81Q-00CN-ST0SwitchInfra item:7560Brand: NVIDIA
Specifications

900-9X81Q-00CN-ST0 specifications

Data Rate: 400GbE / 400Gb/s; Connector: QSFP112; PCIe Interface: PCIe 6 x16; Form Factor: HHHL.
Part NumberC8240
Host interfacePCIe 6 x16; x16 SocketDirect extension option
Port count2
ConnectorQSFP112
Form FactorHHHL / HHHL PCIe card
BrandNVIDIA
Model900-9X81Q-00CN-ST0
PortsDual-port
cryptoYes
familyConnectX-8
categoryvpi_supernic
ConditionNew
Data Rate400GbE / 400Gb/s
protocolsInfiniBand, Ethernet
Secure bootYes
PCIe InterfacePCIe 6 x16
Default protocolEthernet
Speed or computeNDR IB / 400 GbE
Lifecycle literalMass Production
Ports or connector2 QSFP112
Canonical order code900-9X81Q-00CN-ST0
Card dimensions (mm)66.4 x 168.4
Host pcie signal rate gtps64
Optional extension interfacePCIe 5 x16 at 32 GT/s in card specification; qualify auxiliary kit separately
Ethernet supported rates (Gb/s)100, 200, 400
Operating temperature (degrees C)0 to 55

Before you order

  • Confirm the exact SKU, part number, specification option and quantity.
  • Confirm the host platform, port, electrical interface and firmware requirements.
  • Confirm availability, lead time, destination and applicable service terms before payment.
Description
The ConnectX-8 C8240 SuperNIC, order code 900-9X81Q-00CN-ST0, combines two QSFP112 ports with PCIe 6.0 x16 host connectivity. The exact specification lists 400 GbE Ethernet and NDR InfiniBand, with Ethernet as the default protocol. Hardware crypto and secure boot are enabled, and an x16 Socket Direct extension option is documented. Its dual-QSFP112 arrangement is distinct from the single-OSFP XDR C8180 configuration.

Product questions & answers

Is C8240 an 800 Gb/s XDR OSFP card?

No. This exact C8240 uses dual QSFP112 ports and is listed for 400 GbE/NDR. C8180 is the distinct single-OSFP configuration with 800 Gb/s XDR support.

Which protocol is the default?

Ethernet is the documented default for 900-9X81Q-00CN-ST0. Verify the actual port configuration when moving between Ethernet and InfiniBand fabrics.

Does the optional extension operate at the primary PCIe generation?

The primary interface is Gen 6 x16 at 64 GT/s. The C8240 specification describes the optional passive-card extension as Gen 5 x16 at 32 GT/s. The selected accessory assembly must be checked separately.

Are crypto and secure boot enabled?

Yes. Both are explicitly enabled for the exact ST0 code in the model-specific specification.

Which cable family should be selected?

Start from its QSFP112 connectors and intended protocol/rate, then use the validated interconnect list for the hardware and firmware version. A C8180 OSFP cable choice is not automatically transferable.

What remains to be validated for a server?

Confirm the negotiated PCIe state, lane topology, auxiliary assembly, power and airflow, firmware support, connector clearance and intended port configuration under a representative workload.

Describe what you need. You can start without a confirmed quantity or host model.

Channel and project resources

Move your next customer decision forward

Start with your current portfolio, a product family or an incomplete project list. Choose the material that fits your responsibility.

OA03 · NVIDIA

AI Ethernet, adapters and optical or cable interconnects.

900-9X81Q-00CN-ST0

BOM and open-items review

Keep the original part numbers and quantities together with the questions that affect a project decision.

Start with
Your existing list, uploaded BOM or a short description of the requirement. Incomplete lists are welcome.
Use this to prepare
An open-items table with original line references, missing inputs, responsible people and next actions.
Share your project list →Read the practical brief (English)Download the worksheet