{"product_id":"mma4z00-ns400-compatible-400g-osfp-sr4-flat-top-rhs-transceiver-connectx-7","title":"NVIDIA MMA4Z00-NS400 \/ 980-9I51S-00NS00 Compatible 400G OSFP SR4 Flat-Top (RHS) Transceiver — MPO-12\/APC, 850nm MMF, for ConnectX-7","description":"\u003cp\u003e\u003cstrong\u003eFlat-Top (RHS) — the NIC-side module, not the switch-side module\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNVIDIA MMA4Z00-NS400 \/ 980-9I51S-00NS00 compatible — 400G OSFP SR4, 850nm multimode\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"border-left: 3px solid #1e8f5e; background: #f7f8fa; padding: 10px 14px; margin: 14px 0;\"\u003e→ \u003cstrong\u003e\u003ca href=\"\/pages\/nvidia-osfp-transceiver-part-number-crosswalk\"\u003eNVIDIA OSFP part-number crosswalk\u003c\/a\u003e\u003c\/strong\u003e — Mellanox MMA\/MMS numbers mapped to the new NVIDIA 980- numbers, with form factor, optics and the correct part for each end of the link.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMellanox Part Number:\u003c\/strong\u003e MMA4Z00-NS400\u003cbr\u003e\u003cstrong\u003eNVIDIA Part Number:\u003c\/strong\u003e 980-9I51S-00NS00\u003cbr\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e Single-port OSFP SR4 optical transceiver, 400Gb\/s, flat-top \/ Riding Heat Sink (RHS), MPO-12\/APC, multimode\u003c\/p\u003e\n\u003cp\u003eThis is the \u003cstrong\u003eflat-top\u003c\/strong\u003e module — the one that goes in the server, not the switch. If you are populating an OSFP port on a ConnectX-7 or ConnectX-8 adapter, a BlueField-3 DPU, or a DGX system, this is the correct part. Those ports carry their own heatsink built into the port cage, and it rides down on top of whatever module you insert. A finned module has no clearance underneath it and will not seat.\u003c\/p\u003e\n\u003cp\u003eNVIDIA now calls this form factor \u003cstrong\u003eRHS\u003c\/strong\u003e, for \u003cstrong\u003eRiding Heat Sink\u003c\/strong\u003e — the equipment's heatsink rides on the module. Older documentation, existing BOMs and most purchase histories still say \"flat-top.\" Same part.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhich One Do I Need?\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eGoing into\u003c\/th\u003e\n\u003cth\u003eYou need\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnectX-7 \/ ConnectX-8 NIC, BlueField-3 DPU, DGX system\u003c\/td\u003e\n\u003ctd\u003e\n\u003cstrong\u003eFlat-Top (RHS)\u003c\/strong\u003e — this product\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAir-cooled Quantum-2 switch (QM9700 \/ QM9790)\u003c\/td\u003e\n\u003ctd\u003e\u003ca href=\"\/products\/mma4z00-ns-compatible-800g-osfp-sr8-finned-top-ihs-transceiver-quantum-2\"\u003eFinned-Top (IHS) — 800G twin-port module\u003c\/a\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eThe fins are either on the module or on the equipment. Never both, never neither.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe two parts are designed as a pair: one twin-port finned module in the switch → two MPO-12\/APC patch cords → two flat-top modules in two ConnectX-7 servers. \u003cstrong\u003eOne switch module serves two servers.\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMellanox Part Number\u003c\/td\u003e\n\u003ctd\u003eMMA4Z00-NS400\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNVIDIA Part Number\u003c\/td\u003e\n\u003ctd\u003e980-9I51S-00NS00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eForm Factor\u003c\/td\u003e\n\u003ctd\u003eSingle-port OSFP, Flat-Top (Riding Heat Sink \/ RHS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Rate\u003c\/td\u003e\n\u003ctd\u003e400Gb\/s — 4 x 106.125Gb\/s PAM4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOptical Interface\u003c\/td\u003e\n\u003ctd\u003eSR4, 850nm, multimode (MMF)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector\u003c\/td\u003e\n\u003ctd\u003eMPO\/MTP-12 APC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReach\u003c\/td\u003e\n\u003ctd\u003e30m OM3 \/ 50m OM4 — see note below\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtocol\u003c\/td\u003e\n\u003ctd\u003eInfiniBand NDR and 400G Ethernet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHost Platforms\u003c\/td\u003e\n\u003ctd\u003eConnectX-7 and ConnectX-8 OSFP adapters, BlueField-3 DPUs, DGX systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDOM \/ DDM\u003c\/td\u003e\n\u003ctd\u003eSupported\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCoding\u003c\/td\u003e\n\u003ctd\u003eCoded specifically for NVIDIA \/ Mellanox\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandards\u003c\/td\u003e\n\u003ctd\u003eOSFP MSA, IEEE 802.3ck, Class 1 laser, RoHS\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eWarranty\u003c\/td\u003e\n\u003ctd\u003eLifetime, backed by Resilient Tec\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCondition\u003c\/td\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003chr\u003e\n\u003ch2\u003eNote on Reach: Why You'll See Both 50m and 100m\u003c\/h2\u003e\n\u003cp\u003eNVIDIA specifies \u003cstrong\u003e50m over OM4\u003c\/strong\u003e for this module, and that is the figure to design against in an InfiniBand fabric. The optics are built to the SR MSA, which permits up to 100m over OM4 — so both numbers are correct, they just answer different questions. The standard describes what the optics \u003cem\u003ecan\u003c\/em\u003e do under ideal conditions; NVIDIA's number is what they will \u003cem\u003esupport\u003c\/em\u003e.\u003c\/p\u003e\n\u003cp\u003eUsable reach past 50m depends on fiber grade and how many MPO matings sit in the path, because every additional mating costs optical budget. A 90m run through three patch panels is exactly where link margin quietly disappears. \u003cstrong\u003eDesign to 50m for NVIDIA support parity.\u003c\/strong\u003e Planning a longer run? \u003ca href=\"\/pages\/request-a-quote\"\u003eTalk to us first\u003c\/a\u003e.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eGood to Know\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eA finned-top (IHS) module will not physically seat in a ConnectX-7 OSFP port — the cage heatsink is in the way. This is the most common wrong order on this part.\u003c\/li\u003e\n\u003cli\u003e800G is not an upgrade at the server end: the ConnectX-7 OSFP port is a 400G port.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMMA1Z00-NS400\u003c\/strong\u003e is one character away and is \u003cstrong\u003eQSFP112\u003c\/strong\u003e — a different cage entirely. It will not fit an OSFP port.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMMS4X00-NS400\u003c\/strong\u003e is single-mode \u003cstrong\u003eDR4\u003c\/strong\u003e at 1310nm, 500m. The MMA \/ MMS prefix is the tell: MMA is multimode, MMS is single-mode.\u003c\/li\u003e\n\u003cli\u003eRunning single-mode? This is not your module. Tell us what the fiber plant is and we will point you at the right part rather than sell you this one.\u003c\/li\u003e\n\u003cli\u003eLiquid-cooled switch deployments need the 800G flat-top variant (MMA4Z00-NS-FLT), which we do not stock. We will still tell you what to look for.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eQuick Checklist — Is This the Right Module?\u003c\/h2\u003e\n\u003cp\u003eYou are populating an OSFP port on a ConnectX-7 or ConnectX-8 adapter, a BlueField-3 DPU, or a DGX system. The port cage has its own heatsink. Your fiber plant is multimode (OM3 or OM4) with MPO-12\/APC connectors. Your runs are 50m or shorter. You want 400G NDR InfiniBand or 400G Ethernet.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eAvailability\u003c\/h2\u003e\n\u003cp style=\"border-left: 3px solid #1e8f5e; background: #f7f8fa; padding: 10px 14px; margin: 14px 0;\"\u003e\u003cstrong\u003eIn stock: 1 · Additional units ship on a 7–10 day lead time.\u003c\/strong\u003e\u003cbr\u003eBuilding a cluster? Tell us how many ports you are populating and we will quote the switch-side and server-side modules together. \u003ca href=\"\/pages\/request-a-quote\"\u003e\u003cstrong\u003eRequest a quote →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWarranty:\u003c\/strong\u003e lifetime, \u003ca href=\"\/pages\/lifetime-warranty\"\u003ebacked by Resilient Tec\u003c\/a\u003e — not a manufacturer term. When a module fails you reach a named seller in Knoxville, Tennessee, not a ticket queue.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eYou Might Also Need\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/mma4z00-ns-compatible-800g-osfp-sr8-finned-top-ihs-transceiver-quantum-2\"\u003e800G OSFP SR8 Finned-Top (IHS) twin-port transceiver\u003c\/a\u003e — the switch-side half of the link. One of those serves two of these.\u003c\/li\u003e\n\u003cli\u003eMPO-12\/APC multimode patch cords, Type B polarity — the fiber between the two modules\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/blogs\/news\/osfp-dac-cables-what-they-are-when-to-use-one\"\u003eOSFP DAC cables\u003c\/a\u003e — when the run is short enough that copper beats optics\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/pages\/product-guides\"\u003eProduct guides\u003c\/a\u003e — structured cabling, switches and the rest of the rack\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eRelated Guides\u003c\/h2\u003e\n\u003cp\u003e\u003ca href=\"\/blogs\/news\/osfp-flat-top-vs-finned-top-which-module\"\u003eFlat-Top or Finned-Top OSFP? How to Tell Which Module Your ConnectX-7 Actually Needs\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/nvidia-osfp-transceiver-part-number-crosswalk\"\u003eNVIDIA OSFP Part-Number Crosswalk: Mellanox MMA\/MMS to NVIDIA 980- Numbers\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"\/blogs\/news\/osfp-vs-qsfp-dd-gpu-clusters\"\u003eOSFP vs. QSFP-DD: A Practical Breakdown for GPU Clusters\u003c\/a\u003e\u003c\/p\u003e","brand":"Resilient Tec","offers":[{"title":"Default Title","offer_id":49073639194724,"sku":"MMA4Z00-NS400-GT","price":509.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/3482\/4548\/files\/Screenshot2026-08-26165806.png?v=1787778023","url":"https:\/\/resilient-tec.com\/products\/mma4z00-ns400-compatible-400g-osfp-sr4-flat-top-rhs-transceiver-connectx-7","provider":"Resilient Tec","version":"1.0","type":"link"}