NVIDIA B300 (Blackwell Ultra)
Blackwell Ultra: 288 GB of HBM3E and ~1.5x the FP4 for the reasoning-inference era.
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Announced at GTC 2025 as Blackwell Ultra, the B300 raises memory to 288 GB using 12-high HBM3E stacks and lifts dense FP4 throughput roughly 1.5x over B200 — aimed squarely at long-context, high-token reasoning inference. It ships in GB300 NVL72 racks from late 2025 into 2026.
Specifications & key facts
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Overview
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Sources
Record reviewed as of 2026-01-15 — see Methodology.