Elon Musk told SpaceX shareholders that memory, not power or GPUs, now caps his AI compute buildout, putting fresh attention on Micron, the only U.S.-based maker of high-bandwidth memory. Micron shares have climbed sharply in 2026 on tightening supply, though a Motley Fool analysis flags decelerating price growth as a risk to the rally.
On SpaceX's Q2 2026 earnings call on Aug. 4, 2026, Musk answered a question about the pace of AI compute buildout: According to 24/7 Wall St.: "Limiting factor currently is memory." The remark singled out memory over both power and GPU access as his biggest constraint.
That statement lands directly on Micron Technology, the only U.S.-based maker of high-bandwidth memory and one of just three global HBM suppliers. Musk framed the imbalance in his own terms: memory output is growing around 20% a year, he said, while demand is growing around 200% a year — his own characterization on the call, not independently verified industry data.
Musk ruled out power and GPUs on the same call
Musk said SpaceX's tentative target is 20 gigawatts of power and cooling online by the end of next year, though he does not expect to hit that figure. He added that SpaceX's design philosophy is to build far more power and cooling capacity than GPU capacity, since GPUs are the more expensive constraint to balance against. On Nvidia, he said SpaceX expects only a small share of its GPU allocation next year. Power and GPUs were framed as manageable; memory was not.
Tesla echoed the same concern weeks earlier
Two weeks before the SpaceX call, on Tesla's Q2 2026 earnings call around July 23, 2026, Musk thanked Micron by name for a significant memory allocation on reasonable terms and called current memory pricing the biggest price jump he has seen. Micron shares rose 3.1% intraday that day even as Tesla stock fell 14.3% on an earnings miss.
Micron shares up sharply, but cracks in the price story
Micron closed at $971.66 on Aug. 14, up 240.65% year to date from $285.23 at the end of 2025. CEO Sanjay Mehrotra told investors Micron expects tight supply conditions to persist beyond calendar 2027, backed by Strategic Customer Agreements disclosed in its Q3 FY26 filing.
However, a Motley Fool analysis published Aug. 9, 2026 cited TrendForce forecasts for Q3 2026 contract price growth of just 13% to 18% for DRAM, a sharp deceleration from the prior quarter's gains of more than 60%. Wall Street's fiscal 2027 EPS estimates for Micron have reportedly plateaued, suggesting earnings-upside momentum may be cooling.
Agentic AI is reshaping memory demand
Separately, Micron has said each AI agent instance requires memory for state and context tracking, tool-output buffering, sandboxed runtime environments, and retrieval data, according to a Motley Fool report citing a Micron blog post on agentic AI memory needs. High-bandwidth memory reportedly requires at least three times the capital equipment per bit that traditional server DRAM does, tightening supply further as agentic workloads scale.
Sources: 24/7 Wall St., The Motley Fool
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