{"product_id":"njaakk-n911-400g-qsfp112-passive-dac-stacking-cable-0-5m-nvidia-dgx-spark","title":"NJAAKK-N911 400G QSFP112 Passive DAC Stacking Cable, 0.5m – NVIDIA DGX Spark","description":"\u003cp\u003e\u003cstrong\u003ePart Number:\u003c\/strong\u003e NJAAKK-N911\u003cbr\u003e\n\u003cstrong\u003eDescription:\u003c\/strong\u003e 400G QSFP112 Passive Direct Attach Copper (DAC) Stacking Cable, 0.5m (1.6 ft)\u003c\/p\u003e\n\n\u003cp\u003eThe NJAAKK-N911 is NVIDIA's proprietary \u003cstrong\u003e400G QSFP112 passive DAC stacking cable\u003c\/strong\u003e engineered exclusively for the NVIDIA DGX Spark's \u003cstrong\u003ededicated stacking port\u003c\/strong\u003e. This is not the same cable used for standard 200G Ethernet networking — it connects to a separate, purpose-built port on the DGX Spark designed specifically for high-bandwidth, low-latency GPU-to-GPU communication when stacking two Spark units together.\u003c\/p\u003e\n\n\u003cp\u003eUse the NJAAKK-N911 when you need to stack two NVIDIA DGX Spark systems for up to 800GB\/s of combined memory bandwidth. Use the \u003ca href=\"\/products\/q56-200g-cu0-5-0-5-meter-1-6-ft-200g-qsfp56-passive-direct-attach-copper-dac-dgx-spark\"\u003eQ56-200G-CU0-5 200G QSFP56 DAC\u003c\/a\u003e for your ConnectX-7 NIC ports and standard 200G Ethernet networking.\u003c\/p\u003e\n\n\u003chr\u003e\n\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\u003ePart Number\u003c\/td\u003e\n\u003ctd\u003eNJAAKK-N911\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface\u003c\/td\u003e\n\u003ctd\u003eQSFP112\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Rate\u003c\/td\u003e\n\u003ctd\u003e400G (4 × 100G lanes)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCable Type\u003c\/td\u003e\n\u003ctd\u003ePassive Direct Attach Copper (DAC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLength\u003c\/td\u003e\n\u003ctd\u003e0.5 m (1.6 ft)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnector Type\u003c\/td\u003e\n\u003ctd\u003eQSFP112 on both ends\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePort Compatibility\u003c\/td\u003e\n\u003ctd\u003eNVIDIA DGX Spark dedicated stacking port only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUse Case\u003c\/td\u003e\n\u003ctd\u003eDGX Spark 2-unit stack configuration\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtocol\u003c\/td\u003e\n\u003ctd\u003eNVIDIA proprietary stacking link\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eWhat Port Does This Use?\u003c\/h2\u003e\n\u003cp\u003eThe DGX Spark has two distinct port types:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnectX-7 NIC ports (2×)\u003c\/strong\u003e — 200G QSFP56 — used for standard Ethernet networking. Compatible cable: \u003ca href=\"\/products\/q56-200g-cu0-5-0-5-meter-1-6-ft-200g-qsfp56-passive-direct-attach-copper-dac-dgx-spark\"\u003eQ56-200G-CU0-5\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDedicated Stacking port (1×)\u003c\/strong\u003e — QSFP112 — used exclusively for connecting two DGX Sparks together. Compatible cable: \u003cstrong\u003eNJAAKK-N911 (this product)\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThese ports are not interchangeable. The stacking port only accepts QSFP112 connectors and only communicates with NVIDIA's proprietary stacking protocol.\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eImportant Limitations\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eOnly works between \u003cstrong\u003etwo DGX Spark units\u003c\/strong\u003e — cannot connect a DGX Spark to any other NVIDIA system or third-party device\u003c\/li\u003e\n\u003cli\u003eStacking is limited to \u003cstrong\u003e2 units maximum\u003c\/strong\u003e — you cannot chain more than 2 Sparks\u003c\/li\u003e\n\u003cli\u003eThe 0.5m length is the \u003cstrong\u003eonly supported length\u003c\/strong\u003e per NVIDIA's DGX Spark documentation — longer passive DAC cables are not certified\u003c\/li\u003e\n\u003cli\u003eDoes \u003cstrong\u003enot\u003c\/strong\u003e add Ethernet networking capacity — for networking, use the ConnectX-7 ports with the Q56-200G-CU0-5\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eQuick Checklist — Is This the Right Cable?\u003c\/h2\u003e\n\u003cp\u003e✅ You have two NVIDIA DGX Spark units\u003cbr\u003e\n✅ You want to connect them via the dedicated stacking port\u003cbr\u003e\n✅ Your goal is expanded unified memory (up to 800GB\/s combined bandwidth)\u003cbr\u003e\n✅ You need a 0.5m passive copper cable with QSFP112 connectors on both ends\u003c\/p\u003e\n\u003cp\u003e❌ Do NOT use this cable for Ethernet networking — use the \u003ca href=\"\/products\/q56-200g-cu0-5-0-5-meter-1-6-ft-200g-qsfp56-passive-direct-attach-copper-dac-dgx-spark\"\u003eQ56-200G-CU0-5\u003c\/a\u003e for that\u003cbr\u003e\n❌ Do NOT use this cable to connect a DGX Spark to any switch or non-Spark device\u003cbr\u003e\n❌ Do NOT use this for connecting more than 2 DGX Spark units\u003c\/p\u003e\n\n\u003chr\u003e\n\n\u003ch2\u003eRelated Guide\u003c\/h2\u003e\n\u003cp\u003eRead the full technical guide: \u003ca href=\"\/blogs\/news\/nvidia-dgx-spark-stacking-cable-njaakk-n911-what-it-does-who-needs-it-and-how-it-differs-from-the-dac\"\u003eNVIDIA DGX Spark Stacking Cable NJAAKK-N911: What It Does, Who Needs It, and How It Differs from the DAC\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eAlso see: \u003ca href=\"\/blogs\/news\/how-to-connect-two-nvidia-dgx-spark-systems-the-cable-you-need-and-why\"\u003eHow to Connect Two NVIDIA DGX Spark Systems: The Cable You Need and Why\u003c\/a\u003e\u003c\/p\u003e","brand":"NVIDIA","offers":[{"title":"Default Title","offer_id":48626914525284,"sku":"NJAAKK-N911-C","price":167.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0767\/3482\/4548\/files\/MCP1650-H001E30_15c982ca-f236-43b0-a55c-48511fc551cb.jpg?v=1778876117","url":"https:\/\/resilient-tec.com\/products\/njaakk-n911-400g-qsfp112-passive-dac-stacking-cable-0-5m-nvidia-dgx-spark","provider":"Resilient Tec","version":"1.0","type":"link"}