MCP1660-W01AE30 NVIDIA/Mellanox Compatible 400G QSFP-DD Passive DAC Cable — 1.5m
Warranty: Lifetime
QSFP-DD — not OSFP. Passive copper twinax, not optics.
NVIDIA / Mellanox MCP1660-W01AE30 compatible — 400G QSFP-DD passive DAC, 1.5m, 30AWG
→ OSFP vs QSFP-DD for GPU clusters — form-factor fork that decides whether this cable fits your cage at all.
Mellanox / NVIDIA Part Number: MCP1660-W01AE30
NVIDIA 980- Part Number: 980-9I35S-00W01A
Description: 400GbE / 400Gb/s passive Direct Attach Copper (DAC) cable, QSFP-DD to QSFP-DD, 1.5 meters, 30AWG twinax
This is a QSFP-DD passive DAC — the short-reach copper interconnect for QSFP-DD 400G ports. It is not an OSFP cable, and it is not a flat-top / RHS optical module. If your switch, NIC, or GPU node has an OSFP cage, this part will not seat. Use the OSFP DAC family (for example MCP4Y10) instead.
Programmed for NVIDIA / Mellanox ecosystems and built to the QSFP-DD MSA. Hot-pluggable, near-zero power draw (passive), lifetime warranty from Resilient Tec.
Which One Do I Need?
| Going into | You need |
|---|---|
| QSFP-DD 400G ports, ~1.5m intra-rack run, copper is fine | MCP1660-W01AE30 — this product (1.5m, 30AWG, passive DAC) |
| Same QSFP-DD cages, 1m run | MCP1660-W001E30 — 1m QSFP-DD passive DAC |
| Same QSFP-DD cages, 2m run | MCP1660-W002E30 — 2m QSFP-DD passive DAC |
| OSFP cages (Quantum-2 twin-port, DGX H100/H200 OSFP, ConnectX-7 OSFP) | OSFP DAC family (e.g. MCP4Y10) — not this cable |
| Runs longer than ~3m, or you need optical isolation / thinner cable plant | 400G AOC or SR4/DR4 optics — not a passive DAC |
Form factor is the first fork. QSFP-DD and OSFP do not mate. Ordering an OSFP-labeled 400G DAC for a QSFP-DD port — or the reverse — is the most common wrong order on this part family.
Length is the second fork. Passive 400G DAC is a short-reach tool. 1.5m (this PID) is the mid length in the MCP1660-W0xxEyy series (0.5 / 1 / 1.5 / 2 / 2.5 / 3m). Past that, move to AOC or optics.
Technical Specifications
| Specification | Value |
|---|---|
| Mellanox / NVIDIA Part Number | MCP1660-W01AE30 |
| NVIDIA 980- Part Number | 980-9I35S-00W01A |
| Form Factor | QSFP-DD to QSFP-DD (not OSFP) |
| Cable Type | Passive Direct Attach Copper (DAC) / twinax |
| Data Rate | 400Gb/s — 400GbE (400G-CR8 PAM4 class) |
| Length | 1.5 m (≈ 4.9 ft) |
| Wire Gauge | 30 AWG |
| Power Consumption | Passive — typically < 0.1W |
| Protocol | 400GbE Ethernet; InfiniBand NDR where the host QSFP-DD port supports it |
| Host Platforms | NVIDIA / Mellanox and MSA-compliant QSFP-DD 400G ports (switches, NICs, GPU nodes) — verify your exact platform matrix |
| Standards | QSFP-DD MSA, IEEE 802.3ck / 400GBASE-CR8 class, RoHS |
| Operating Temperature | 0°C to 70°C (commercial) |
| Coding | Coded specifically for NVIDIA / Mellanox compatibility |
| Warranty | Lifetime, backed by Resilient Tec |
| Condition | New |
Note on Reach: Why Passive DAC Stops Around 3m
NVIDIA’s MCP1660-W0xxEyy series tops out at 3 meters for passive 400G QSFP-DD copper. That is not a marketing preference — it is the practical limit of passive twinax at 400G before insertion loss and crosstalk eat the link. 1.5m (this part) sits in the middle of the family and is the usual choice for adjacent-rack or deep-rack QSFP-DD jumpers when 1m is short and 2m is longer than you need.
If your run is past ~3m, or you need a thinner cable for dense cable management, move to a 400G AOC or to SR4/DR4 optics with the correct fiber. Do not stretch a passive DAC past its rated length and hope — the link will either refuse to train or fail intermittently under load.
Good to Know
- This is QSFP-DD, not OSFP. Older listing copy on this SKU incorrectly said OSFP / RHS / flat-top. Those terms describe OSFP optical modules and OSFP DACs — a different cage. This cable only fits QSFP-DD ports.
- Passive means no retimers in the cable. Power and heat stay on the host. That is why DAC wins for short intra-rack links, and why it loses past a few meters.
- Sibling lengths we stock: MCP1660-W001E30 (1m) and MCP1660-W002E30 (2m). Same family, same form factor.
- OSFP DAC is a different family (MCP4Y10 and related). If your BOM says OSFP, stop — this PID will not work.
- EEPROM is programmed for NVIDIA / Mellanox recognition. MSA-compliant third-party QSFP-DD hosts often work; always confirm against your platform’s supported transceiver / cable list for production fabrics.
- Bend radius matters near the connector — treat the boot as a fixed radius zone, not a place to cinch zip-ties.
Quick Checklist — Is This the Right Cable?
You have two QSFP-DD 400G ports. The run is about 1.5 meters. You want passive copper (not AOC, not SR4/DR4 optics). Your BOM or platform list accepts MCP1660-W01AE30 / 980-9I35S-00W01A. You are not filling an OSFP cage.
Availability
Currently out of stock · Additional units typically available on short lead time.
Building a rack or filling a spare kit? Tell us how many QSFP-DD 400G jumpers you need (1m / 1.5m / 2m) and we will quote the set. Request a quote →
Warranty: lifetime, backed by Resilient Tec — not a manufacturer term. When a cable fails you reach a named seller in the US, not a ticket queue.
You Might Also Need
- MCP1660-W001E30 — 400G QSFP-DD Passive DAC, 1m
- MCP1660-W002E30 — 400G QSFP-DD Passive DAC, 2m
- MCP4Y10-N001 — OSFP 400G NDR Passive DAC, 1m — when the cage is OSFP, not QSFP-DD
- MCP4Y10-N002 — OSFP 400G NDR Passive DAC, 2m
- Product guides · Request a quote
Related Guides
OSFP vs. QSFP-DD: A Practical Breakdown for GPU Clusters
OSFP DAC Cables — What They Are and When to Use One
NVIDIA & Mellanox Interconnect Compatibility Guide
QSFP-DD — not OSFP. Passive copper twinax, not optics.
NVIDIA / Mellanox MCP1660-W01AE30 compatible — 400G QSFP-DD passive DAC, 1.5m, 30AWG
→ OSFP vs QSFP-DD for GPU clusters — form-factor fork that decides whether this cable fits your cage at all.
Mellanox / NVIDIA Part Number: MCP1660-W01AE30
NVIDIA 980- Part Number: 980-9I35S-00W01A
Description: 400GbE / 400Gb/s passive Direct Attach Copper (DAC) cable, QSFP-DD to QSFP-DD, 1.5 meters, 30AWG twinax
This is a QSFP-DD passive DAC — the short-reach copper interconnect for QSFP-DD 400G ports. It is not an OSFP cable, and it is not a flat-top / RHS optical module. If your switch, NIC, or GPU node has an OSFP cage, this part will not seat. Use the OSFP DAC family (for example MCP4Y10) instead.
Programmed for NVIDIA / Mellanox ecosystems and built to the QSFP-DD MSA. Hot-pluggable, near-zero power draw (passive), lifetime warranty from Resilient Tec.
Which One Do I Need?
| Going into | You need |
|---|---|
| QSFP-DD 400G ports, ~1.5m intra-rack run, copper is fine | MCP1660-W01AE30 — this product (1.5m, 30AWG, passive DAC) |
| Same QSFP-DD cages, 1m run | MCP1660-W001E30 — 1m QSFP-DD passive DAC |
| Same QSFP-DD cages, 2m run | MCP1660-W002E30 — 2m QSFP-DD passive DAC |
| OSFP cages (Quantum-2 twin-port, DGX H100/H200 OSFP, ConnectX-7 OSFP) | OSFP DAC family (e.g. MCP4Y10) — not this cable |
| Runs longer than ~3m, or you need optical isolation / thinner cable plant | 400G AOC or SR4/DR4 optics — not a passive DAC |
Form factor is the first fork. QSFP-DD and OSFP do not mate. Ordering an OSFP-labeled 400G DAC for a QSFP-DD port — or the reverse — is the most common wrong order on this part family.
Length is the second fork. Passive 400G DAC is a short-reach tool. 1.5m (this PID) is the mid length in the MCP1660-W0xxEyy series (0.5 / 1 / 1.5 / 2 / 2.5 / 3m). Past that, move to AOC or optics.
Technical Specifications
| Specification | Value |
|---|---|
| Mellanox / NVIDIA Part Number | MCP1660-W01AE30 |
| NVIDIA 980- Part Number | 980-9I35S-00W01A |
| Form Factor | QSFP-DD to QSFP-DD (not OSFP) |
| Cable Type | Passive Direct Attach Copper (DAC) / twinax |
| Data Rate | 400Gb/s — 400GbE (400G-CR8 PAM4 class) |
| Length | 1.5 m (≈ 4.9 ft) |
| Wire Gauge | 30 AWG |
| Power Consumption | Passive — typically < 0.1W |
| Protocol | 400GbE Ethernet; InfiniBand NDR where the host QSFP-DD port supports it |
| Host Platforms | NVIDIA / Mellanox and MSA-compliant QSFP-DD 400G ports (switches, NICs, GPU nodes) — verify your exact platform matrix |
| Standards | QSFP-DD MSA, IEEE 802.3ck / 400GBASE-CR8 class, RoHS |
| Operating Temperature | 0°C to 70°C (commercial) |
| Coding | Coded specifically for NVIDIA / Mellanox compatibility |
| Warranty | Lifetime, backed by Resilient Tec |
| Condition | New |
Note on Reach: Why Passive DAC Stops Around 3m
NVIDIA’s MCP1660-W0xxEyy series tops out at 3 meters for passive 400G QSFP-DD copper. That is not a marketing preference — it is the practical limit of passive twinax at 400G before insertion loss and crosstalk eat the link. 1.5m (this part) sits in the middle of the family and is the usual choice for adjacent-rack or deep-rack QSFP-DD jumpers when 1m is short and 2m is longer than you need.
If your run is past ~3m, or you need a thinner cable for dense cable management, move to a 400G AOC or to SR4/DR4 optics with the correct fiber. Do not stretch a passive DAC past its rated length and hope — the link will either refuse to train or fail intermittently under load.
Good to Know
- This is QSFP-DD, not OSFP. Older listing copy on this SKU incorrectly said OSFP / RHS / flat-top. Those terms describe OSFP optical modules and OSFP DACs — a different cage. This cable only fits QSFP-DD ports.
- Passive means no retimers in the cable. Power and heat stay on the host. That is why DAC wins for short intra-rack links, and why it loses past a few meters.
- Sibling lengths we stock: MCP1660-W001E30 (1m) and MCP1660-W002E30 (2m). Same family, same form factor.
- OSFP DAC is a different family (MCP4Y10 and related). If your BOM says OSFP, stop — this PID will not work.
- EEPROM is programmed for NVIDIA / Mellanox recognition. MSA-compliant third-party QSFP-DD hosts often work; always confirm against your platform’s supported transceiver / cable list for production fabrics.
- Bend radius matters near the connector — treat the boot as a fixed radius zone, not a place to cinch zip-ties.
Quick Checklist — Is This the Right Cable?
You have two QSFP-DD 400G ports. The run is about 1.5 meters. You want passive copper (not AOC, not SR4/DR4 optics). Your BOM or platform list accepts MCP1660-W01AE30 / 980-9I35S-00W01A. You are not filling an OSFP cage.
Availability
Currently out of stock · Additional units typically available on short lead time.
Building a rack or filling a spare kit? Tell us how many QSFP-DD 400G jumpers you need (1m / 1.5m / 2m) and we will quote the set. Request a quote →
Warranty: lifetime, backed by Resilient Tec — not a manufacturer term. When a cable fails you reach a named seller in the US, not a ticket queue.
You Might Also Need
- MCP1660-W001E30 — 400G QSFP-DD Passive DAC, 1m
- MCP1660-W002E30 — 400G QSFP-DD Passive DAC, 2m
- MCP4Y10-N001 — OSFP 400G NDR Passive DAC, 1m — when the cage is OSFP, not QSFP-DD
- MCP4Y10-N002 — OSFP 400G NDR Passive DAC, 2m
- Product guides · Request a quote
Related Guides
OSFP vs. QSFP-DD: A Practical Breakdown for GPU Clusters
OSFP DAC Cables — What They Are and When to Use One
NVIDIA & Mellanox Interconnect Compatibility Guide