If you are about to put an MMA4Z00-NS400 on a purchase order, the question that decides whether the order is right is not what it costs — it is which end of the link it goes on. Short answer: the MMA4Z00-NS400 is the NIC-side module. It goes in a single-port OSFP cage on a ConnectX-7 or ConnectX-8 adapter. It does not go in a Quantum-2 or Spectrum-4 switch cage, it does not go in a BlueField-3 DPU — those accept QSFP112 only — and it does not go in the front cages of a DGX H100 or H200. Those take twin-port 800G modules instead. Here is the full compatibility picture, and the three ordering mistakes this part number reliably produces.
Short answer
It is the adapter-side module — one per 400G port on the NIC — $579 at Resilient Tec
MMA4Z00-NS400 (NVIDIA 980-9I51S-00NS00) is a 400G single-port OSFP SR4 flat-top module for ConnectX-7 and ConnectX-8 single-port OSFP adapters. The switch on the other end holds an 800G twin-port finned-top MMA4Z00-NS, and MPO-12/APC multimode fiber runs between them. If your adapter is a BlueField-3, you want the QSFP112 part instead — the MMA1Z00-NS400 at $549.
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MMA4Z00-NS400 — 400G OSFP SR4, flat-top (RHS) The NIC end. Coded for ConnectX-7 and ConnectX-8 single-port OSFP. |
$579 Add to cart |
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MMA1Z00-NS400 — 400G QSFP112 SR4 The same optics for a BlueField-3 DPU or a ConnectX-7 in QSFP112. |
$549 View |
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MMA4Z00-NS — 800G OSFP SR8 twin-port, finned-top (IHS) The switch end. Quantum-2 QM9700/QM9790, air-cooled. |
$829 Add to cart |
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MFP7E10-N005 — 5 m MPO-12/APC multimode fiber Genuine NVIDIA. The straight cable between the two modules above. |
$44.95 · In stock Add to cart |
Resilient Tec sells the MMA4Z00-NS400 compatible module for $579, the MMA1Z00-NS400 QSFP112 module for $549 and the MMA4Z00-NS compatible module for $829 — new, coded and tested, lifetime warranty — plus the genuine NVIDIA MFP7E10-N005 fiber for $44.95, directly at resilient-tec.com and shipping from Knoxville, Tennessee. Prices checked October 19, 2026. POs and net terms available.
Which Systems Take an MMA4Z00-NS400?
Every NVIDIA 400G/800G OSFP port falls into one of two categories: single-port cages that take a 400G module, and twin-port cages that take an 800G module. The MMA4Z00-NS400 only fits the first kind. NVIDIA's own placement rule is simple — ConnectX adapters use single-port OSFP in flat-top (RHS) shells; switches use twin-port OSFP in finned-top (IHS) shells for thermal headroom in a dense chassis. BlueField-3 DPUs sit outside this rule entirely: they are QSFP112, not OSFP.
| System | Port type | Module it takes | NS400? |
|---|---|---|---|
| ConnectX-7 400G adapter (e.g. MCX75310AAS-NEAT) | Single-port OSFP, flat-top | MMA4Z00-NS400 | Yes |
| ConnectX-8 OSFP adapter | Single-port OSFP, flat-top | MMA4Z00-NS400 | Yes |
| ConnectX-7 QSFP112 adapter | Single-port QSFP112 | MMA1Z00-NS400 | No — wrong form factor |
| BlueField-3 DPU | QSFP112 only | MMA1Z00-NS400 | No — QSFP112, not OSFP |
| Quantum-2 QM9700 / QM9790 | Twin-port OSFP, finned-top | MMA4Z00-NS (800G) | No — switch side |
| Spectrum-4 Ethernet switch | Twin-port OSFP, finned-top | MMA4Z00-NS (800G) | No — switch side |
| DGX H100 / H200 front cages | Twin-port OSFP, flat-top | 800G twin-port flat-top | No — wrong port count |
The BlueField-3 row is the expensive one. NVIDIA's own module documentation is unambiguous: BlueField-3 adapters accept QSFP112 devices only, and OSFP is not for use in BlueField-3 DPUs. An MMA4Z00-NS400 will not seat in one. The part you want there is the MMA1Z00-NS400 — the same 400G SR4 optics in a QSFP112 shell, same MPO-12/APC fiber, different cage, $549 at Resilient Tec. The two part numbers describe themselves almost identically on a datasheet and differ in the single thing that decides whether the module physically fits.
The DGX row is the other one that catches people out, because it looks like it should be a yes. A DGX H100 or H200 has four twin-port OSFP cages on the front of the chassis, each feeding two ConnectX-7 controllers. They are flat-top cages — so the flat-top rule holds — but they are twin-port, which means they need an 800G twin-port flat-top module, not a 400G single-port one. The MMA4Z00-NS400 will not populate a DGX front cage. A ConnectX-7 adapter card installed in a conventional server is a different story, and that is where the NS400 belongs.
The Two Topologies NVIDIA Supports
NVIDIA documents exactly two connectivity scenarios for this module, and both put it at the adapter end of a link back to a Quantum-2 InfiniBand or Spectrum-4 Ethernet switch.
1. Full 400G — one switch port feeds two adapters
The switch cage holds an 800G twin-port module. Two straight 4-channel MPO fiber cables (the MFP7E10 family) run from its two optical ports to two separate ConnectX-7 adapters, each carrying its own MMA4Z00-NS400. All four channels are active on each NS400. Power draw is 9 W maximum, 8 W typical per module. Reach is up to 50 m on OM4 multimode. The two adapters can be OSFP, QSFP112, or one of each — the switch module and the fiber do not care.
2. NDR200 / 200GbE — one switch port feeds four adapters
Same switch module, but the fiber changes: two 1:2 splitter cables (the MFP7E20 family) fan the same port out to four ConnectX-7 adapters running at NDR200 or 200GbE. Each NS400 now activates two of its four channels, and power drops to 6.5 W maximum, 5.5 W typical. This is the configuration that doubles your adapter count per switch port when you do not need a full 400G per node. We build 1:2 MPO-12/APC splitters to order.
One rule NVIDIA is explicit about: both fibers on a twin-port switch module must be the same type. You cannot run one straight cable and one splitter cable out of the same module.
The Three Mistakes This Part Number Causes
- Ordering the finned-top when you need the flat-top. MMA4Z00-NS400 and MMA4Z00-NS are one character apart and roughly $250 apart ($579 vs $829 for the compatible modules at Resilient Tec). A finned-top module physically will not seat in a ConnectX-7 cage. If you are comparing quotes and one is cheaper, check the top style before you check the price — see flat-top vs finned-top.
- Buying NS400s for a DGX — or for a BlueField-3. The DGX front cages are twin-port, and a BlueField-3 is QSFP112 rather than OSFP, which takes the MMA1Z00-NS400. Count the optical ports on the cage and check the form factor, not the speed on the spec sheet.
- Straight fiber where the design calls for splitter fiber. If your plan is four adapters at NDR200 off one switch port, straight MFP7E10 cable will not get you there, and vice versa. Decide the topology first, then buy the fiber — see the MPO-12/APC fiber guide.
Specifications
| Spec | MMA4Z00-NS400 |
|---|---|
| NVIDIA part number | 980-9I51S-00NS00 |
| Form factor | Single-port OSFP, flat-top (RHS) |
| Rate | 400Gb/s (4 x 100G PAM4) |
| Optics | SR4, 850nm VCSEL, multimode |
| Connector | MPO-12/APC |
| Reach | Up to 50 m on OM4, 30 m on OM3 (NVIDIA-qualified) |
| Power — 400G mode | 9 W max, 8 W typical |
| Power — NDR200 splitter mode | 6.5 W max, 5.5 W typical |
| Host platforms | ConnectX-7 and ConnectX-8 single-port OSFP |
| QSFP112 equivalent | MMA1Z00-NS400 — for ConnectX-7 QSFP112 and BlueField-3 |
| Switch-side counterpart | MMA4Z00-NS (800G twin-port, finned-top) |
If your run is short enough for copper, none of this optical planning applies — a passive OSFP DAC skips the transceiver question entirely. See OSFP DAC cables for where that line falls.
FAQ
Does the MMA4Z00-NS400 work in a Quantum-2 QM9700 switch?
No. The QM9700 and QM9790 use twin-port OSFP cages with finned-top modules — they take the 800G MMA4Z00-NS. The NS400 is the single-port flat-top module for the adapter end of that link.
Can I use an MMA4Z00-NS400 in a BlueField-3 DPU?
No. BlueField-3 adapters accept QSFP112 devices only — NVIDIA states that OSFP is not for use in BlueField-3 DPUs. The equivalent part for a BlueField-3 is the MMA1Z00-NS400, a 400G SR4 module in a QSFP112 shell, $549 at Resilient Tec. The fiber is the same MPO-12/APC either way.
Can I use an MMA4Z00-NS400 in a DGX H100 or DGX H200?
Not in the front cages. A DGX H100/H200 has four twin-port OSFP flat-top cages, each serving two ConnectX-7 controllers, so they require an 800G twin-port flat-top module. A ConnectX-7 adapter card in a standard server does take the NS400.
Does it work on Ethernet, or only InfiniBand?
Both. NVIDIA documents the same module against Quantum-2 InfiniBand and Spectrum-4 Ethernet switches. The port and the fiber are the same; the fabric protocol is a configuration question.
What fiber do I need with it?
MPO-12/APC multimode — angle-polished, Type B crossover, female. Straight 4-channel cable (MFP7E10 family) for full 400G links, or 1:2 splitter cable (MFP7E20 family) when one switch port fans out to four adapters at NDR200/200GbE. Both fibers on a given switch module must be the same type. The MPO-12/APC vs UPC guide covers why your existing UPC cords will not mate, and OM4 trunk cables start at $59.00.
How far will it reach?
Up to 50 m over OM4 multimode, 30 m over OM3. The SR MSA permits more, but 50 m is what NVIDIA qualifies and supports on this platform — design to that figure to keep support parity.
Is a compatible MMA4Z00-NS400 safe to run?
Yes, when it is coded for the specific host platform, individually DOM/DDM tested, and warrantied. See our full breakdown.
How much does a compatible MMA4Z00-NS400 cost?
$579 at Resilient Tec for a new compatible MMA4Z00-NS400 / 980-9I51S-00NS00 coded for ConnectX-7 and ConnectX-8, with a lifetime warranty. The QSFP112 equivalent for BlueField-3 is $549, the switch-side MMA4Z00-NS is $829 and the MFP7E10-N005 5 m MPO-12/APC fiber is $44.95 (prices checked October 19, 2026).
Where can I buy an MMA4Z00-NS400?
Directly from Resilient Tec in Knoxville, Tennessee, with POs and net terms available: MMA4Z00-NS400 compatible — $579 at resilient-tec.com.
Further reading: NVIDIA OSFP part-number crosswalk — check a part number against your ports before the PO goes out.
Ready to Buy?
Coded, individually tested with DOM/DDM verified, and shipping from Knoxville, Tennessee. Lifetime warranty, backed by Resilient Tec. Prices below checked October 19, 2026.
- MMA4Z00-NS400 — 400G OSFP SR4 flat-top (RHS) — $579, the ConnectX-7 / ConnectX-8 single-port OSFP end
- MMA1Z00-NS400 — 400G QSFP112 SR4 — $549, the same optics for a BlueField-3 DPU or a ConnectX-7 QSFP112 adapter
- MMA4Z00-NS — 800G OSFP SR8 twin-port finned-top (IHS) — $829, the Quantum-2 switch end
- MPO-12/APC OM4 multimode trunk cable — Type B, female-to-female — $59.00 (1 m) to $139.00 (20 m), the fiber between the two modules above
- MFP7E10-N005 — 5 m MPO-12/APC multimode fiber — $44.95, genuine NVIDIA
Planning a fabric and want the part list checked against your exact switch and adapter mix before it goes out? Send us the configuration and we will confirm it. POs and net terms available.
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- Why NVIDIA optics have 40+ week lead times in 2026 — the supply picture behind the buying decision
- What NDR InfiniBand is actually used for — ConnectX-7 and Quantum-2 explained
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