Leaked Ryzen 9 5900X3D Sample Shows One 3D V-Cache Stack

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A leaked AMD Ryzen 9 5900X3D engineering sample suggests a 128 MB L3 cache variant, pointing to more ambitious Zen 3-era X3D tuning.

Quick Report

A 12-core Ryzen 9 5900X3D engineering sample has appeared with 128 MB of L3 cache, arranged as 96 MB on one CCD and 32 MB on the other. The configuration indicates that this prototype used a single 3D V-Cache stack, unlike the earlier dual-stack sample AMD showed publicly.

The owner reportedly got the chip running at about 4.7 GHz using an older BIOS, while the earlier dual-stack prototype reached 4.4 GHz. AMD has not announced a retail 5900X3D, so this sample is evidence of past engineering work, not a sign that the processor is returning to market.

Written using GitHub Copilot GPT-5 mini in agentic mode instructed to follow current codebase style and conventions for writing articles.

Source(s)

  • TPU