Nvidia’s next flagship AI machine has hit a wall, and the culprit is a single circuit board. The Kyber rack meant to house its 2027 Rubin Ultra chips has slipped to 2028.
Research firm SemiAnalysis flagged the delay, and CNBC reported it. Kyber is not a chip. It is a server cabinet. It packs 144 of Nvidia’s most powerful GPUs into one unit, so they behave like a single giant computer. That density is what trains and runs the largest AI models.
One board, one big problem
The hold-up sits in an unglamorous part. Kyber mounts its chips in vertical trays to cram more in and cut latency. Tying it all together is a multi-layer circuit board called the PCB midplane. That board, SemiAnalysis said, “remains challenging from a manufacturability standpoint.” In plain terms, Nvidia cannot yet build it at scale.
The knock-on effects spread from there. A larger system, the NVL576, links eight racks with optical cables. It is likely delayed too, or held to tiny volumes. Nvidia did not comment.
