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Bluefield-4 DPU expected to feature 128GB LPDDR5X DRAM for high-capacity QLC NAND cache
Monday, January 5, 2026 at 11:05 PM
The Bluefield-4 DPU appears to incorporate 128GB of LPDDR5X DRAM (four 32GB modules), potentially serving as a cache for 100TB QLC NAND SSDs to enable DRAM-less storage configurations.
Context
Nvidia has detailed its next-generation BlueField-4 DPU, scheduled for early availability in 2026 as a cornerstone of the Vera Rubin platform. The processor is expected to feature a massive 128GB LPDDR5X DRAM subsystem, a significant upgrade designed to serve as a high-capacity cache for large-scale storage. By integrating this memory directly onto the DPU, Nvidia aims to support ultra-high-capacity 100TB QLC NAND SSDs in a "DRAM-less" configuration, where the DPU handles the caching duties typically managed by individual drive controllers.
This architectural shift is a critical component of the new Inference Context Memory Storage Platform, which targets long-context AI workloads. The BlueField-4 will deliver 800Gb/s throughput and utilizes a 64-core Grace CPU with up to 126 billion transistors to offload complex networking and storage tasks from the host. For investors, this represents a major efficiency play in the AI supply chain; the platform claims up to a 5x improvement in tokens-per-second and 5x greater power efficiency by eliminating data bottlenecks between storage and GPUs.
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