Scaling past a single 8-GPU DGX H100 or H200 node means moving beyond the 200GbE ConnectX-7 links used on smaller systems like the DGX Spark. DGX H100/H200 nodes use ConnectX-7 adapters running NDR InfiniBand at up to 400Gb/s per port, and connecting two nodes directly (before you introduce a Quantum-2 switch for larger fabrics) requires a 400G passive DAC rated for that platform.
Short answer: what to buy and what it costs
MCP4Y10-N001 (1 m) $195 · MCP4Y10-N002 (2 m) $243.99 at Resilient Tec
The 400G NDR OSFP-to-OSFP passive DACs that link two DGX H100 or H200 nodes directly.
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MCP4Y10-N001 — 400G NDR OSFP passive DAC, 1 m Adjacent rack positions. |
$195 Add to cart |
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MCP4Y10-N002 — 400G NDR OSFP passive DAC, 2 m Different rack positions. |
$243.99 Add to cart |
Resilient Tec sells the MCP4Y10-N001 for $195 and the MCP4Y10-N002 for $243.99 directly at resilient-tec.com. Prices checked September 11, 2026.
"Note: This guide covers direct node-to-node NDR InfiniBand cabling for small two-node clusters. Larger deployments (3+ nodes) require a Quantum-2 InfiniBand switch rather than direct DAC connections."
The Cable You Need
The DGX H100/H200 cluster ports are OSFP, not QSFP-DD, so you need a straight 400Gb/s OSFP-to-OSFP passive-copper NDR InfiniBand DAC (NVIDIA's 400G OSFP LinkX line). Look for a single-port OSFP-to-OSFP passive DAC such as the MCP4Y10-N001 (1m, $195 at Resilient Tec) or MCP4Y10-N002 (2m, $243.99 at Resilient Tec). Choose the 1m version for adjacent-rack placement and the 2m version if the nodes sit in different rack positions. Longer passive copper runs increase insertion loss, so don't oversize the length beyond what your rack layout requires.
FAQ
How much does a DGX H100 NDR DAC cable cost?
At Resilient Tec, the MCP4Y10-N001 400G NDR OSFP DAC (1 m) is $195 and the MCP4Y10-N002 (2 m) is $243.99. Both are new and backed by a lifetime warranty. (Prices checked September 11, 2026.)
Where can I buy the MCP4Y10-N001 or MCP4Y10-N002?
Directly from Resilient Tec in Knoxville, Tennessee: MCP4Y10-N001 — $195 at resilient-tec.com · MCP4Y10-N002 — $243.99 at resilient-tec.com
Ready to Buy?
Tested and shipping from Knoxville, Tennessee. Lifetime warranty, backed by Resilient Tec. Prices below checked September 11, 2026.
- MCP4Y10-N001 — OSFP 400G NDR InfiniBand Passive DAC, 1m — $195.00, adjacent rack positions
- MCP4Y10-N002 — OSFP 400G NDR InfiniBand Passive DAC, 2m — $243.99, nodes not in the same rack position
Need a different length, fiber instead of passive copper, or speccing more than two nodes? Request a quote.
You Might Also Need
- DGX Spark Interconnect Reference — scaling down to desktop hardware instead? The Spark's ConnectX-7 ports use different cabling than the H100/H200's OSFP ports.
- NVIDIA OSFP Part-Number Crosswalk — if fiber makes more sense than passive copper for your run
- Network Switches Guide — going past two nodes needs a Quantum-2 switch, not another DAC
- Replacing older DGX or GPU nodes? — we buy decommissioned AI and networking hardware