Nvidia's Kyber rack-scale architecture, designed to house its 2027 Rubin Ultra chips, has been delayed by more than 12 months to 2028, according to research firm SemiAnalysis in a post on Monday. The setback stems from difficulties manufacturing a key circuit board at the heart of the system, specifically the PCB midplane which remains challenging from a manufacturability standpoint. The delay adds to mounting strains across Nvidia's product lines, raising questions about whether the AI giant's breakneck annual release cadence is colliding with manufacturing limits.
Nvidia Kyber Architecture Houses 144 Chips in Vertical Configuration
Kyber is a server cabinet that packs 144 of Nvidia's most powerful chips into a single unit so they can work together as one giant computer, providing the horsepower AI companies need to train and run their most advanced models. The design mounts graphics processing units in compute trays that sit vertically instead of horizontally to boost density and reduce latency. Kyber had been slated to debut with Vera Rubin Ultra, Nvidia's next-generation rack-scale system, in 2027.
PCB Midplane Manufacturing Challenges Cause 2028 Delay
"Kyber NVL144 rack architecture has been delayed to 2028 as the PCB midplane remains challenging from a manufacturability standpoint," SemiAnalysis said, referring to a specialized, multi-layer printed circuit board that connects electronic modules within a system. NVL576, a larger system linking eight racks via optical connections, is also likely delayed or limited to small volumes, the research firm said. Nvidia did not respond to CNBC's request for comment.
Nvidia Cancels Two-Rack Alternative After Cloud Provider Rejection
A backup plan involving bolting two of Nvidia's current-generation racks together for similar power has been scrapped after cloud customers rejected the design as awkward and costly to operate. "It has since been cancelled due to heavy pushback from CSPs [cloud service providers] and hyperscalers over its odd design and heavy operational burden," SemiAnalysis said. That leaves Nvidia with "no proven solution to expand the scale-up world size for Rubin Ultra," SemiAnalysis said, predicting that could give rivals Advanced Micro Devices and Google, whose in-house chips are already winning business from top AI labs, a rare technical opening at the high end of the market.
Current-Generation Rubin Systems Ship Fall 2026 to Eight Cloud Partners
Nvidia's current-generation Rubin systems are in full production and begin shipping this fall to eight cloud partners, including Amazon Web Services, Microsoft Azure and Google Cloud. SemiAnalysis also projects Nvidia's data-center compute revenue will run 20% above Wall Street consensus in the second half of fiscal 2027. Shares of Nvidia fluctuated in premarket trading, last down less than 0.1% at $194.79.
FAQ
What caused Nvidia's Kyber rack system delay to 2028?
The delay stems from difficulties manufacturing the PCB midplane, a specialized multi-layer printed circuit board that connects electronic modules within the system, which remains challenging from a manufacturability standpoint according to SemiAnalysis.
What is Nvidia's Kyber architecture designed to do?
Kyber is a server cabinet that packs 144 of Nvidia's most powerful chips into a single unit in vertical compute trays, allowing them to work together as one giant computer to provide the horsepower AI companies need to train and run their most advanced models.
When do Nvidia's current-generation Rubin systems begin shipping?
Nvidia's current-generation Rubin systems are in full production and begin shipping this fall to eight cloud partners, including Amazon Web Services, Microsoft Azure and Google Cloud.
