Nvidia's next-generation Kyber NVL144 AI server rack faces a delay of more than a year, pushing its launch into 2028, according to analysis from research firm SemiAnalysis reported in July 2026. The primary cause is the manufacturing difficulty of its central multilayer printed circuit board (PCB).
July 6, 2026 · AI Infrastructure
Nvidia's 144-GPU 'Kyber' Rack Slips to 2028
A multilayer "PCB midplane" that remains hard to manufacture has pushed the next-generation Rubin Ultra rack back by more than a year — rattling Asian PCB suppliers and reviving fears of AI supply-chain bottlenecks.
2028
New launch target — a slip of more than a year from 2027
144
GPUs per rack, for the Rubin Ultra generation
8
Major clouds still set to receive current Rubin in fall 2026
GPU density doubles — and so does the manufacturing strain
GPUs packed into a single rack, current vs. next generation
Doubling GPU scale and expanding the NVLink domain exposed the manufacturing limits of high-density, high-power multilayer boards.
The bottleneck
A single unmanufacturable board is holding back the whole rack.
PCB MIDPLANE
The multilayer board linking modules at high speed — still hard to manufacture.
BACKUP CANCELED
A plan to link two current racks (NVL72×2) was dropped after cloud-operator pushback.
SUPPLY STRAIN
High-performance PCB lead times have stretched to 12–20 weeks in 2026.
Cautious view
The annual release cadence is hitting a manufacturing ceiling — repeated delays could open a window for AMD and Google's in-house chips at the high-performance end.
Constructive view
The current Rubin system is on track, with second-half FY2027 data-center revenue projected to top Wall Street consensus by 20% — long-term growth still intact.
Note: Kyber NVL144 is unreleased, so there are almost no real-world user assessments yet — the current focus is on market and analyst reaction. Nvidia declined to comment.
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