This pricing guide covers only the 400G flat-top MMA4Z00-NS400 / 980-9I51S-00NS00 (ConnectX-7 / ConnectX-8 NIC side). It is not the 800G twin-port MMA4Z00-NS used on Quantum-2 switches. Short answer: for the NVIDIA MMA4Z00-NS400 / 980-9I51S-00NS00 flat-top (RHS) 400G OSFP SR4 module — the one that goes into a ConnectX-7 or ConnectX-8 single-port OSFP adapter, or a DGX system — U.S. pricing for a compatible module currently runs from $579 to $769, and genuine NVIDIA OEM stock through authorized distribution runs $883 to $1,535. Where a given seller falls in that range usually comes down to three things: whether the module is genuine OEM or compatible, how many hands it passed through before it reached you, and whether anyone actually coded and tested it against ConnectX-7 before it shipped. The $579 low end is Resilient Tec’s price for a compatible MMA4Z00-NS400 coded for ConnectX-7, sold new with a lifetime warranty and shipped from Knoxville, Tennessee.
Here's the fuller picture, and where it's easy to get burned even after you've picked a price. Populating the 800G switch side of the same link? See the MMA4Z00-NS 800G OSFP SR8 finned-top pricing guide (Quantum-2 twin-port — not this 400G NIC-side module). Populating a BlueField-3? That is a different part number entirely — the QSFP112 MMA1Z00-NS400 at $549.
U.S. Pricing Comparison — MMA4Z00-NS400 Flat-Top (RHS)
| Supplier | Price | Type | Fulfillment |
|---|---|---|---|
| Resilient Tec | $579.00 | Compatible, coded for ConnectX-7 | Knoxville, TN — in stock, online checkout |
| HPC Optics | $599.00 | Compatible | Chicago, IL |
| FS.com | $769.00 | Compatible | New Castle, DE / City of Industry, CA |
| ServerSupply | $850 – $990 | Surplus / open-box, genuine OEM | New York, NY |
| ServerOrbit | $883.50 | Genuine OEM | US domestic stock |
| eSaitech | $943.00 | Genuine OEM | US domestic stock |
| Insight | $1,035.99 | Genuine OEM, new | US authorized distribution |
| Connection (PC Connection) | $1,130.09 | Genuine OEM, new | US enterprise fulfillment |
| Colfax Direct | $1,535.00 | Genuine OEM, new | California — AI/HPC integrator |
Prices observed the week of August 25, 2026, and change without notice — verify current pricing and stock before ordering from any listed source, including us.
In stock at Resilient Tec · $579.00 · Additional units ship on a 7–10 day lead time.
Building a cluster? Tell us how many ports you are populating and we'll quote the switch-side and server-side modules together. Request a quote →
Genuine OEM vs. Compatible: What the Price Gap Actually Buys
The $500 gap between the cheapest compatible module and Colfax's OEM listing isn't padding — it's two different supply chains. Genuine NVIDIA OEM stock carries NVIDIA's factory firmware, ships through an authorized distribution tier, and usually rides on a corporate account with volume terms baked into list price. That's the right call if procurement policy requires OEM part numbers on the PO, or if the deployment is under a support contract that specifies factory optics.
Compatible modules are built to the same OSFP MSA and SR4 optical spec on third-party hardware, then coded to answer the host's firmware handshake the way the OEM module would. The coding step is where compatible modules succeed or fail — a module that isn't coded for the specific host platform can get flagged or rejected even though the optics are fine. That's a real failure mode, not a theoretical one, and it's why "compatible" spans a $260 range on its own: some sellers test against ConnectX-7 and NDR InfiniBand specifically, others sell one SKU across every OSFP host and let the customer find out which switches accept it.
The Other Way to Get This Wrong: Flat-Top vs. Finned-Top
Price isn't the only place this part number trips people up. MMA4Z00-NS400 covers a flat-top (RHS) module built for the NIC side of the link — ConnectX-7, ConnectX-8, DGX — and a separate finned-top (IHS) module built for air-cooled Quantum-2 switches. The fins live on whichever side doesn't already have a heatsink built into the port cage; a finned module physically will not seat in a ConnectX-7 OSFP port, and a flat-top module won't provide the cooling a switch port needs. One switch-side finned module typically serves two server-side flat-top modules over MPO-12/APC patch cords — see the 800G OSFP SR8 pricing guide for that module's own cost breakdown.
One platform that is not on that list: BlueField-3. NVIDIA states that BlueField-3 adapters accept QSFP112 devices only, and that OSFP is not for use in BlueField-3 DPUs. Nothing in this price table will seat in one. The 400G SR4 part for a BlueField-3 is the MMA1Z00-NS400, the same optics in a QSFP112 shell, $549 at Resilient Tec — slightly cheaper than the OSFP part, and the only one that will physically go in.
Every listing in the table above is priced against the flat-top module specifically. If a price looks unusually low, confirm which variant is actually being quoted before comparing it — a finned-top listing at a lower price isn't a better deal, it's the wrong part.
If you aren't certain which variant your ports take, settle that before you spend anything — it takes about two minutes: Flat-Top or Finned-Top OSFP? How to Tell Which Module Your ConnectX-7 Actually Needs covers the rule, the RHS/IHS renaming, and the near-miss part numbers that won't physically fit an OSFP cage.
Don't Forget the Fiber
The module is the expensive line on the PO, but it is not the line that delays the cutover. NDR optics take MPO-12/APC fiber — angle-polished, Type B crossover, female — and the MPO-12/UPC cords already installed in a 100G or 200G fabric will not mate with them. Budget the fiber alongside the modules: the MPO-12/APC vs UPC guide covers what to check, and OM4 Type B trunk cables run $59.00 to $139.00 at Resilient Tec.
Why the Cheapest Listing Isn't Always the Riskiest One
Marketplace listings (eBay, cross-border sellers on aggregator feeds) can undercut every price in this table, and that's exactly where "compatible" stops meaning tested-and-coded and starts meaning unknown provenance. The meaningful comparison isn't compatible-vs-OEM, it's tested-and-warrantied vs. untested, regardless of which category a seller falls into. A module coded for ConnectX-7, backed by a real warranty, and sold by someone who answers the phone when it fails is worth more than the sticker price implies — and it's also why this comparison sticks to name-brand U.S. distributors and stocking sellers rather than marketplace listings with no traceable seller behind them.
FAQ
Is a compatible MMA4Z00-NS400 as good as genuine NVIDIA OEM?
Optically, a properly built compatible module meets the same SR4 spec. The differentiator is coding and testing against the specific host platform — ConnectX-7, ConnectX-8, DGX — and what happens when a module fails. OEM stock makes sense when a support contract or procurement policy requires it; compatible modules make sense everywhere else, provided the seller actually validates against your platform.
Why is there such a wide price range for the same part number?
Genuine OEM pricing reflects NVIDIA's factory firmware and authorized distribution overhead. Compatible pricing reflects how much testing, coding, and support backs the module — plus ordinary distributor markup. Marketplace listings outside this comparison can go lower still, at the cost of any of that.
Do I need the flat-top or finned-top version?
Flat-top (RHS) for the NIC side — ConnectX-7, ConnectX-8, DGX single-port OSFP. Finned-top (IHS) for air-cooled Quantum-2 switches. Flat-top or finned-top? walks the decision in full, and the NVIDIA OSFP part-number crosswalk has the full mapping.
Does a BlueField-3 DPU take the MMA4Z00-NS400?
No. BlueField-3 accepts QSFP112 devices only — NVIDIA states that OSFP is not for use in BlueField-3 DPUs. The equivalent part is the MMA1Z00-NS400 in a QSFP112 shell, $549 at Resilient Tec, running on the same MPO-12/APC fiber.
What fiber do I need to go with it?
MPO-12/APC multimode, Type B crossover, female. UPC cords from a 100G or 200G fabric will not mate with an NDR module. Resilient Tec stocks OM4 Type B trunks from $59.00 (1 m) to $139.00 (20 m), and 1:2 splitters for NDR200 mode are built to order. (Prices checked October 19, 2026.)
What's covered under warranty?
Resilient Tec backs this module with a lifetime warranty — reachable directly, not routed through a manufacturer ticket queue.
How much does a compatible MMA4Z00-NS400 cost at Resilient Tec?
$579 for a new compatible MMA4Z00-NS400 / 980-9I51S-00NS00 flat-top (RHS) module coded for ConnectX-7 and ConnectX-8, with a lifetime warranty. The QSFP112 equivalent for BlueField-3 is $549 and the switch-side MMA4Z00-NS 800G finned-top module is $829 (prices checked October 19, 2026).
Where can I buy an MMA4Z00-NS400 in the US?
Resilient Tec sells it directly from Knoxville, Tennessee, with online checkout and POs or net terms for business accounts: MMA4Z00-NS400 compatible — $579 at resilient-tec.com. Genuine NVIDIA OEM stock is available through the authorized distributors in the table above at $883 to $1,535.
Resilient Tec stocks and tests the MMA4Z00-NS400 flat-top module for $579, coded specifically for ConnectX-7 and ConnectX-8, ships from the US, and backs it with a lifetime warranty. Populating more than a handful of ports? Request a quote and we'll price the switch-side and server-side modules together.
Ready to Buy?
New, coded specifically for NVIDIA/Mellanox, shipping from Knoxville, Tennessee. Lifetime warranty, backed by Resilient Tec. Prices below checked October 19, 2026.
- 400G OSFP SR4 Flat-Top (RHS) — MMA4Z00-NS400 / 980-9I51S-00NS00 compatible — $579, the module this guide prices, for ConnectX-7, ConnectX-8 and DGX single-port OSFP ports
- 400G QSFP112 SR4 — MMA1Z00-NS400 compatible — $549, the same optics for a BlueField-3 or a ConnectX-7 QSFP112 adapter
- 800G OSFP SR8 Finned-Top (IHS) — MMA4Z00-NS compatible — $829, the switch-side half of the same link, for air-cooled Quantum-2
- 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 pair
- NVIDIA OSFP part-number crosswalk — check a part number against your ports before the PO goes out
Populating a cluster? Tell us the port count and we'll quote the pair together — remember it's one switch-side module for every two servers. Running single-mode, building liquid-cooled, or populating BlueField-3? Ask — we'd rather point you at the right part than sell you the wrong one.
You might also need
- Flat-top vs finned-top OSFP — the technical decision behind this price comparison
- MPO-12/APC vs UPC fiber for NDR optics — the fiber between a transceiver pair, and why your existing cords won't mate
- OSFP DAC cables — when the run is short enough that copper beats optics entirely
- Optical transceivers guide — 1G SFP through 800G OSFP, across platforms
- Network switches — Arista, Cisco, HPE/Aruba and Mellanox, new and tested pre-owned
- Cat8 and structured cabling for the rest of the rack