Tesla unveils AI4 Plus upgrade, doubling RAM to 64 GB
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- Elon Musk announced on Tesla's Q1 2026 earnings call that the company will introduce an AI4.1/AI4 Plus upgrade that doubles per‑chip RAM from 16 GB to 32 GB, raising total system memory to 64 GB.
- Tesla said the AI4 Plus upgrade will also deliver about a 10 % increase in compute performance and memory bandwidth, and is slated for production next year pending Samsung’s completion of the RAM modification.
- AI4.5 was quietly shipped in January 2026 in the Model Y, using a three‑chip design rather than the original two‑chip architecture, marking the first AI4 revision.
- HW3 hardware, sold in millions of vehicles since 2019, was confirmed by Musk to lack the memory bandwidth needed for unsupervised Full‑Self‑Driving, prompting plans for “micro‑factories” to retrofit roughly 4 million cars.
- AI4 currently provides roughly 384 GB/s memory bandwidth with GDDR6, exceeding comparable NVIDIA chips, but its 32 GB total memory falls short of the 64 GB capacity that AI4 Plus will provide.
- Tesla intends that AI5 chips will be deployed in Optimus robots and data‑center workloads rather than in vehicles, while AI4 is positioned as sufficient for unsupervised FSD for the near term.
Why it matters: Tesla’s acknowledgment that HW3 lacks the bandwidth for unsupervised FSD forces the company to retrofit roughly 4 million legacy cars, while the imminent AI4 Plus rollout—doubling RAM and boosting compute—signals that even the newer AI4 platform may need replacement within a few years, affecting owners and Tesla’s hardware credibility.
