NVIDIA's Vera Rubin AI chips have seen significant upgrades in key specifications over time, as Team Green aims to maintain its competitive lead over AMD's MI455X platform.
NVIDIA Plans to Ramp Up Vera Rubin Memory Bandwidth By Bumping HBM4 Specs, Taking a Lead Over AMD's MI455X
The Vera Rubin platform from NVIDIA is one of the company's most highly anticipated releases in the AI infrastructure race, driven by the tremendous upgrades Team Green has brought in within the architecture. We are looking at entirely revamped GPUs, CPUs, networking chips, along with other elements that shape the architecture to be powerful for agentic and inference workloads. However, according to recent reports, NVIDIA has restructured certain Vera Rubin elements, and this move is claimed to be a response to AMD's pursuit of the Instinct MI455X AI chips.
According to SemiAnalysis, NVIDIA's Vera Rubin NVL72 specifications will now feature a memory bandwidth of 22.2 TB/s, a massive increase from the initial specifications disclosed at GTC 2025. This sudden jump is an indication that NVIDIA plans to maintain its lead in hyperscaler adoption and, more importantly, that agentic AI systems taking over the lead this year have made higher memory bandwidth onboard an essential requirement, prompting NVIDIA to be aggressive with its Rubin specifications.
If you are curious about how NVIDIA has progressed from 13TB/s to almost 22.2TB/s of memory bandwidth, well, the company has been pursuing HBM4 specifications that exceed the standard JEDEC rating, reportedly asking suppliers to raise pin speeds up to 11 Gbps. Compared to AMD, NVIDIA also employs a narrower 8-stack interface, which is why overclocking pin speeds is the way to lead memory bandwidth. AMD had maintained the lead early on by focusing on 12-Hi HBM4 stacks, which yielded a 19.6TB/s figure.
AMD has shown immense confidence towards its Instinct MI400 series in the past as well, and it appears that Team Red is expecting to provide hyperscalers with a much competitive option this time. It would be interesting to see whether we could witness a shift in market shares once Rubin and MI455X become mainstream.
About the author: Muhammad Zuhair is a hardware and technology reporter for Wccftech, specializing in the semiconductor industry and the complex interplay between technology, manufacturing, and geopolitics. His coverage focuses on the corporate strategies and technological roadmaps of industry giants like TSMC, NVIDIA, Samsung, and Intel. Zuhair's expertise lies in deconstructing complex topics such as fabrication nodes (e.g., 2nm process), the economic impact of policies like the CHIPS Act, and the strategic development of AI infrastructure from NVIDIA, AMD and Intel.
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