Arm Gains Ground in AI Servers as Arm-Based GPU Systems Overtake x86

What happened

IDC reported that Arm-based rack-scale GPU servers have overtaken x86 systems in market share, providing a tangible validation of Arm's data-center momentum. The news aligns with management's claims that data-center royalty revenue more than doubled year-over-year in the latest quarter, driven by hyperscaler adoption. However, the master report maintains a Potential Sell rating, emphasizing that Arm's valuation at P/E 427 and EV/EBITDA 270 leaves no margin for error. Mobile application processors still represent ~43% of royalty revenue, and regulatory risks including an FTC probe and export-control uncertainties remain unresolved. While the IDC data is a positive data point, it does not alter the fundamental risk-reward skew, which remains unfavorable at current prices.

Implication

The report validates Arm's data-center traction, but extreme valuation and regulatory overhangs limit upside. Watch for sustained >100% YoY data-center royalty growth and a declining mobile mix before considering a position.

Thesis delta

The IDC data confirms the bullish data-center narrative but does not address core risks of mobile dependency, regulatory probes, and high valuation. Thesis remains cautious; no material shift.