NVIDIA MMS4X00-NS400 Compatible 400G OSFP DR4 Flat-Top (RHS) Transceiver — MPO-12/APC SMF, 1310nm, 500m, for ConnectX-7

Flat-Top (RHS) — the NIC-side module, not the switch-side module.

NVIDIA MMS4X00-NS400 compatible — 400G OSFP DR4, 1310 nm single-mode, four 100G-PAM4 lanes over a single MPO-12/APC interface, rated 2 to 500 metres. Coded for NVIDIA. For ConnectX-7 and ConnectX-8 single-port OSFP host adapters.

This is the part people get wrong. DR-class modules are single-mode. The SR4 and SR8 modules of the same generation are multimode. Moving from SR to DR is a change to your fiber plant, not a firmware-and-swap upgrade:

• Different fiber. OS2 9/125 single-mode, not OM3/OM4 multimode. An OM4 cable in this port will look like a loss problem and cost you an afternoon.
• Different reach. 500 m here against 50 m on the multimode SR4 part. That is the reason to be on DR at all.
• Same connector, still APC. MPO-12/APC, 8° angled endface. The UPC cords from a 100G or 200G fabric will not mate with it — the full fiber guide is here.

This is an OSFP module. It goes in a single-port OSFP cage on a ConnectX-7 or ConnectX-8 adapter.

It does not go in a BlueField-3. NVIDIA states that BlueField-3 adapters accept QSFP112 devices only, and that OSFP is not for use in BlueField-3 DPUs. If you are populating BlueField-3 on multimode, the part you want is the MMA1Z00-NS400 in QSFP112; on single-mode, ask us and we will source the QSFP112 DR part rather than ship you a module that cannot seat.

The module is pinned; the fiber connector carries the matching holes. That is why the cable you want is female/unpinned, and why a pinned trunk connector is the wrong thing to put in this port.

500 m is the module's optical budget, not a patch-cable specification. NVIDIA's own single-mode assemblies for this generation stop at 150 m — past that you are into structured cabling, patch panels and a loss budget you have to actually calculate. Every MPO mating in the path costs you, and at these distances the connectors are most of the budget, not the fiber.

If your run is inside a rack or a row, a single patch cable does it and the 500 m number is headroom you will never touch.

Flat-top (RHS) is the host adapter part: it sits in a NIC cage in an air-cooled server, and the system's own airflow does the cooling. Finned-top (IHS) is the switch part, with an integrated heat sink for a switch chassis.

They are not interchangeable and they are not a preference. If you are populating a ConnectX-7 or ConnectX-8 single-port OSFP cage, this flat-top part is the one. If you are populating a Quantum-2 switch, you want the twin-port module instead.

In stock at Resilient Tec. Quantities are limited. For a larger order, tell us your quantity and we will quote it. Request a quote →

Shipped from Knoxville, Tennessee. Free standard shipping on all US orders, no minimum. Building a pod? Tell us your node count and we will quote the modules and the cables together.

Warranty: lifetime, backed by Resilient Tec — not a manufacturer term. When something fails you reach a named seller in Knoxville, not a ticket queue.

• MPO-12/APC OS2 single-mode trunk cable — the cable this module needs, one per port
• MMA4Z00-NS400 — 400G OSFP SR4 — the multimode equivalent, if your plant is OM3/OM4 rather than OS2
• MMA1Z00-NS400 — 400G QSFP112 SR4 — the QSFP112 multimode part, for BlueField-3 and ConnectX-7 QSFP112
• MPO-12/APC 1:2 splitter cables — built to order in single-mode or multimode, for NDR200 fan-out
• MPO-12/APC vs UPC: why your existing fiber won't work with NDR optics — endface, pinning, polarity and key orientation
• NVIDIA OSFP part-number crosswalk — flat-top vs finned-top, SR vs DR, before you order
• Transceivers — the rest of the optics catalog