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Message: [QUOTE="Queen, post: 84866, member: 27"] NVIDIA cranked memory bandwidth way up on Vera Rubin, clearly side-eyeing AMD and daring hyperscalers to blink first. Big picture first [LIST] [*]NVIDIA keeps iterating on Vera Rubin because staying ahead of AMD is the whole game right now. [*]The upgrades read like a defensive flex against the Instinct MI455X platform rather than a casual refresh. [/LIST] Why Vera Rubin matters [LIST] [*]The Vera Rubin platform is shaping up as one of NVIDIA’s most anticipated AI infrastructure plays. [*]Entirely revamped GPUs, CPUs, and networking chips are being lined up for agentic and inference-heavy workloads. [*]This is not a tweak cycle; it is a structural rethink aimed straight at hyperscalers. [/LIST] The competitive pressure point [LIST] [*]Reports suggest NVIDIA reshuffled parts of Vera Rubin specifically because AMD is pushing hard with Instinct MI455X. [*]That pressure seems to have forced faster, more aggressive spec decisions than originally planned. [/LIST] Memory bandwidth jumps hard [LIST] [*]According to SemiAnalysis, Vera Rubin NVL72 now lands at 22.2 TB per second of memory bandwidth. [*]That is a massive leap from the specs NVIDIA showed earlier at GTC 2025. [*]The jump signals how critical memory bandwidth has become for agentic AI systems this year. [/LIST] How NVIDIA pulled it off [LIST] [*]NVIDIA reportedly pushed HBM4 beyond standard JEDEC specifications. [*]Suppliers were asked to raise pin speeds up to 11 Gbps. [*]NVIDIA’s narrower eight-stack interface makes pin speed the main lever for winning bandwidth. [/LIST] AMD’s different approach [LIST] [*]AMD chased bandwidth earlier by leaning into 12-Hi HBM4 stacks. [*]That strategy delivered around 19.6 TB per second, giving AMD an early edge. [*]The contrast shows two very different philosophies colliding at the top end. [/LIST] Market implications ahead [LIST] [*]AMD has already shown confidence in the Instinct MI400 series, setting expectations for MI455X. [*]Once Vera Rubin and Instinct MI455X hit mainstream deployment, market share shifts are very much on the table. [*]Hyperscalers are likely to decide this one, not spec sheets alone. [/LIST] [/QUOTE]

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