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NVIDIA DGX Spark compatible — 200G QSFP56 passive DAC cable
→ DGX Spark interconnect reference — approved part numbers, real-world throughput, and what to buy at two, three and four or more nodes.
Part Number: MCP1650-V00AE30 (NVIDIA / Mellanox equivalent)
Description: QSFP56 Passive Direct Attach Copper (DAC) cable, 200G-rated, 0.5m (1.6 ft)
The MCP1650-V00AE30 is a 0.5m passive direct-attach copper cable with QSFP56 connectors on both ends, rated for 200G. It is engineered to connect NVIDIA DGX Spark systems directly through their ConnectX-7 QSFP ports — no switch, transceivers, or adapters required. Each ConnectX-7 QSFP port on the DGX Spark operates at up to 200 Gb/s, which this QSFP56 200G cable matches exactly, making it a viable, tried-and-tested lower-cost interconnect for two units side by side, or for three- and four-unit rings.
Because the NVIDIA GB10 reference design is shared across the ecosystem, the same ConnectX-7 200GbE port — and therefore this same cable — also works on the OEM GB10 systems (Dell Pro Max with GB10, HP ZGX Nano AI Station, and ASUS Ascent GX10). NVIDIA remains the primary platform; the others are cross-compatible because they use identical networking silicon.
Technical Specifications
| Specification |
Value |
| Part Number |
MCP1650-V00AE30 (NVIDIA / Mellanox equivalent) |
| Interface |
QSFP56 |
| Cable Rating |
200G-rated (4 x 50G PAM4 lanes) |
| Link speed on DGX Spark / GB10 systems |
Up to 200 Gb/s per port |
| Cable Type |
Passive Direct Attach Copper (DAC) |
| Length |
0.5 m (1.6 ft) |
| Gauge |
30 AWG twinax |
| Power Draw |
Under 0.1 W (no active components) |
| Connector Type |
QSFP56 on both ends |
| Connector Gender |
Male to male |
| Port Used |
ConnectX-7 QSFP port |
| Port Mode |
Ethernet (with RoCE), not InfiniBand |
| Standards |
QSFP56 MSA, IEEE 802.3bj, IEEE 802.3cd, RoHS |
How Many Units Can You Connect?
-
2 units: one cable, port to port. No switch.
-
3 units: three cables in a ring, using both QSFP ports on every unit. Still no switch.
-
4 units, no switch: four cables in a ring. It works, but it needs a custom NCCL topology and NVIDIA does not support it. How it's done →
-
4 or more units with a switch: the supported route. One cable per unit into a QSFP-DD switch port, with each port pinned to 200G.
Choose Your Length
| Length |
Part number |
Gauge |
Typical use |
| 0.5 m |
MCP1650-V00AE30 (this cable) |
30 AWG |
Two units side by side, tightly stacked rings |
| 1 m |
MCP1650-V001E30 |
30 AWG |
Rings, stacked units, adjacent switch |
| 1.5 m |
MCP1650-V01AE30 |
30 AWG |
Top-of-rack switch, a few units away |
| 2 m |
MCP1650-V002E26 |
26 AWG |
Desk or shelf to switch, half-rack runs |
| 3 m |
MCP1650-V003E26 |
26 AWG |
Full-rack runs, longest passive reach |
Good to Know
- No switch, transceivers, or adapters required for two or three units
- 0.5 m is ideal for two compact desktop units placed side by side; for switch runs or spread-out units, use the 1–3 m versions above
- The ConnectX-7 QSFP ports operate in Ethernet mode (with RoCE), not InfiniBand
- Also works across the wider GB10 ecosystem (Dell Pro Max with GB10, HP ZGX Nano AI Station, ASUS Ascent GX10), which share the same ConnectX-7 200GbE networking
- The port and cable are identical across brands, but the physical location and labeling of the ConnectX-7 port can differ by chassis — confirm the port location in your vendor manual before cabling
Quick Checklist — Is This the Right Cable?
You have two or more NVIDIA DGX Spark systems (or GB10-based equivalents from Dell, HP, or ASUS). You want to link them directly through their ConnectX-7 QSFP ports. You want a proven, lower-cost 200G option that runs at the full 200 Gb/s the port supports. The units sit close together, so a 0.5 m passive copper cable with QSFP56 connectors on both ends reaches.
Related Guides
How to Connect Two NVIDIA DGX Spark Systems: The Cable You Need and Why
Why Connect Two (or More) NVIDIA DGX Sparks? Hardware Limits, Topologies, and Scaling Explained
Can You Build a 4-Node DGX Spark Cluster Without a Switch?
Does the DGX Spark Cable Work with the ASUS Ascent GX10, Dell Pro Max GB10, and HP GB10 Systems?
COMPATIBILITY DOCUMENTATION
Download compatibility report: MCP1650-V00AE30_Compatibility_Report
Guide includes: compatibility notes for NVIDIA DGX Spark and OEM GB10 platforms, ConnectX-7 200GbE port verification, and dual-system interconnect setup instructions.
