NVIDIA High-Speed Cables: Key Considerations for 400G/800G Interconnect Selection and Cabling
November 14, 2025
As data centers evolve to support AI, HPC, and cloud workloads, the demand for higher network bandwidth continues to accelerate. NVIDIA's 400G and 800G high-speed cable solutions provide critical infrastructure for next-generation data center interconnects, offering performance and reliability for the most demanding applications.
Understanding High-Speed Cable Technologies
NVIDIA offers two primary types of high-speed cabling solutions for 400G and 800G deployments:
- Direct Attach Copper (DAC) Cables: Passive or active copper cables ideal for short-reach applications up to 3 meters. They provide cost-effective connectivity within racks or between adjacent racks.
- Active Optical Cables (AOC): Fiber optic cables with integrated transceivers suitable for longer distances up to 100 meters. AOC solutions offer lighter weight, better flexibility, and electromagnetic immunity.
Selection Criteria for 400G/800G Deployment
When choosing between DAC and AOC for your 400G/800G infrastructure, consider these critical factors:
- Distance Requirements: DAC cables are optimal for reaches up to 3 meters, while AOC supports distances from 3 to 100 meters.
- Power Consumption: Passive DAC cables consume zero additional power, while active DAC and AOC solutions require minimal power for signal conditioning.
- Cost Considerations: DAC generally offers lower cost for short reaches, while AOC provides better value for longer distances.
- Weight and Flexibility: AOC cables are significantly lighter and more flexible, making them ideal for high-density configurations.
Technical Specifications Comparison
| Parameter | 400G DAC | 400G AOC | 800G DAC | 800G AOC |
|---|---|---|---|---|
| Max Distance | 3 m | 100 m | 3 m | 100 m |
| Power Consumption | 0W (passive) | ~3.5W | 0W (passive) | ~4.5W |
| Latency | Ultra-low | Low | Ultra-low | Low |
Best Practices for 400G/800G Cable Deployment
Proper installation and management of high-speed cables are crucial for maintaining signal integrity and system reliability:
- Maintain minimum bend radius: 30mm for DAC, 15mm for AOC
- Avoid tight cable bundles that can cause signal degradation
- Implement proper strain relief at connection points
- Use appropriate cable management accessories for high-density configurations
- Regularly inspect connectors for contamination and damage
Future-Proofing Your Infrastructure
As data rates continue to increase toward 1.6T and beyond, selecting the right cable infrastructure today ensures smooth transitions to higher speeds tomorrow. NVIDIA's high-speed cable solutions are designed with backward compatibility and forward scalability in mind, protecting your investment while enabling performance growth.
Whether deploying 400G for current needs or planning for 800G future requirements, understanding the trade-offs between DAC and AOC technologies helps optimize both performance and total cost of ownership for modern data center environments.