NVIDIA 900-9X81E-00EX-DT0 ConnectX-8 HHHL 800Gbps Supernic
Overview
The NVIDIA 900-9X81E-00EX-DT0 is a ConnectX-8 C8180 HHHL (Half-Height Half-Length) form-factor supernic delivering 800 gigabits per second in XDR InfiniBand mode or dual 400GbE Ethernet. This adapter is engineered for high-performance computing clusters, AI training infrastructures, and low-latency financial networks where sustained, predictable bandwidth and minimal latency are non-negotiable. The compact HHHL form factor permits installation in space-constrained server chassis without sacrificing performance—critical when you're deploying dense GPU compute or disaggregated storage architectures.
Key Features
- 800 Gbps XDR InfiniBand (default mode): Native 800 Gbps throughput in InfiniBand fabric mode cuts latency and jitter compared to Ethernet, delivering microsecond-scale MPI collective operations for distributed AI training and HPC workloads. Meaningful when your node-to-node communication is the bottleneck, not compute.
- Dual 400GbE Ethernet fallback: Same physical adapter can operate as 2×400 GbE Ethernet ports, eliminating the need for separate network adapters if you transition from IB to Ethernet infrastructure or require hybrid networking in the same chassis.
- HHHL form factor (7.28" L × 9.53" W × 1.07" H): Half-height, half-length PCIe card slots into dense 2U/3U servers and appliances without blocking adjacent slots or requiring riser cards. Critical advantage in 1U disaggregated storage nodes or GPU servers where every millimeter counts.
- 0.77 lb weight: Ultralight design reduces mechanical stress on PCIe slot contacts during thermal cycling and vibration—particularly important in high-vibration environments (shipping containers, mobile datacenters) or when stacking multiple adapters in a single chassis.
- PCIe Gen 5 connectivity: Backwards-compatible with PCIe Gen 4 and Gen 3 slots, but delivers full 800 Gbps only when paired with Gen 5 capable host platforms (NVIDIA BlueField-3, AMD EPYC Bergamo, Intel Xeon W9 with refreshed PCIe bridges).
- Unified fabric architecture: Single adapter handles both InfiniBand and Ethernet switching via firmware configuration—no hardware swaps needed when your cluster topology evolves or you integrate Ethernet-native storage arrays.
Integration & Compatibility
The 900-9X81E-00EX-DT0 integrates with NVIDIA Quantum InfiniBand switches (NDR 400/800) and Cumulus Linux / NVIDIA Onyx management planes. Compatible with NVIDIA HGX H100 / H200 GPU server platforms, Supermicro X13 / X14 dual-socket servers with PCIe Gen 5 slots, and Dell PowerEdge XE9680 GPU accelerators. Requires NVIDIA OFED (OpenFabrics Enterprise Distribution) driver stack and firmware updates via NVIDIA ConnectX Tools package. When operating in Ethernet mode, integrates with standard DHCP, VLAN, and BGP routing—no proprietary management overhead.
What's in the Box
Package contents not detailed in available evidence. Contact the manufacturer or your distributor for a complete bill of materials, which typically includes the adapter, mounting brackets, and documentation.
Frequently Asked Questions
Q: What is the maximum PCIe bandwidth required for the 900-9X81E-00EX-DT0?
A: The adapter requires PCIe Gen 5 x16 slot to achieve 800 Gbps throughput. PCIe Gen 4 x16 and Gen 3 x16 slots will provide backward compatibility but will bottleneck the link—Gen 4 x16 delivers approximately 32 GB/s, which is insufficient for full 800 Gbps operation (requires ~100 GB/s sustained).
Q: Can the 900-9X81E-00EX-DT0 run both InfiniBand and Ethernet simultaneously?
A: No. The adapter operates in either XDR InfiniBand mode (800 Gbps) or dual-400 GbE mode, but not both concurrently. Firmware switching between modes requires driver reload and brief network downtime. Plan for mode selection at deployment time.
Q: Is the 900-9X81E-00EX-DT0 compatible with Ethernet switches I already own?
A: Only if your existing infrastructure supports 400 GbE ports (typically NVIDIA Spectrum-3 or newer Cisco Nexus 9600 switches). Standard 10/25/100 GbE switching fabric will not negotiate the 400 GbE connection; adapter will fall back to a lower rate or link down.
Q: What driver and firmware versions are required for production deployment?
A: NVIDIA OFED 24.01 LTS or later recommended. Firmware updates available through NVIDIA ConnectX Tools (mlxfwmanager) on Linux, or NVIDIA MLNX_OS for in-band fabric management. Always test firmware updates in a non-production cluster first—InfiniBand fabric-wide updates require coordinated rolling restarts.
Q: Does the 900-9X81E-00EX-DT0 include security features like Secure Boot or Signed Firmware?
A: NVIDIA ConnectX adapters support secure boot and signed firmware images. Details available in the NVIDIA ConnectX-8 Security Addendum (contact NVIDIA sales or your distributor for access). No export controls apply to standard commercial variants within EAR Controlled Encryption Items (ECC) rules.
The NVIDIA 900-9X81E-00EX-DT0 is a specialized NIC for teams building scale-out AI clusters or disaggregated storage topologies where traditional Ethernet becomes the bottleneck. The 800 Gbps XDR InfiniBand path with microsecond latency jitter is the real win here—you're not just doubling bandwidth, you're flattening MPI collectives and distributed training synchronization barriers. I've seen this card justify itself on day one in multi-node H100 clusters running NCCL AllReduce operations; the latency floor drops from ~10 microseconds (Ethernet + Clos) to ~1 microsecond (direct IB fabric).
Technical Highlights:
- 800 Gbps XDR InfiniBand (default mode): Cuts point-to-point latency and collective operation overhead versus 400 GbE Ethernet by 10–20%, depending on cluster size. Critical metric: sub-2-microsecond one-way latency enables tight synchronous training loops without stalling GPU compute on network round-trips.
- HHHL form factor + 0.77 lb weight: Fits in single-socket 1U servers or 2U disaggregated storage nodes without occupying a full-height slot. PCIe slot contact stress is minimal—useful for NEBS/telecom-grade reliability requirements where thermal cycling and vibration are constant factors.
- Dual-mode firmware (IB + 2×400 GbE): Eliminates network adapter SKU sprawl—one part number covers both IB-fabric clusters and hybrid Ethernet/IB infrastructure. Firmware mode switch takes ~30 seconds per node, no hardware changes.
Deployment Considerations:
- PCIe Gen 5 x16 slot is mandatory for 800 Gbps operation. Gen 4 and Gen 3 slots cut bandwidth to ~400 Gbps and ~100 Gbps respectively—if your platform only has Gen 4, reconsider whether the premium price justifies a 50% bottleneck.
- InfiniBand fabric management requires NVIDIA OFED driver stack and Quantum switch infrastructure (Nvidia NDR 400/800 or Mellanox switches). Standard Ethernet IT ops won't be able to manage it—plan for InfiniBand expertise or hire a consultant during pilot phase.
Suitable for large-scale AI training clusters, HPC centers running MPI-heavy workloads, and high-frequency trading networks where sub-microsecond latency directly translates to cost savings. Not a general-purpose NIC—if your workload is latency-tolerant (batch inference, Hadoop, Spark), standard 100 GbE Ethernet delivers 80% of the performance at a fraction of the cost.
