AI infrastructure capex narrative remains intact despite extreme valuations

The AI infrastructure capex story remains the dominant narrative driving equity markets, with data center operators, network equipment makers, and foundry-adjacent names continuing to attract capital flows despite already extreme valuations. CoreWeave CEO statement that Nvidia must expand AI capacity or risk losing customers to AMD has struck a nerve with investors, simultaneously signaling both the health of demand and emerging competitive risk. Cerebras is raising its IPOInitial Public Offering - a company's first public sale of stock. price range to $150-$160 per share (from $115-$125 previously) and increasing the share count marketed to 30 million, a sign that institutional demand for AI infrastructure plays remains robust even at elevated entry multiples.

The narrative centers on a 'Goldilocks' scenario: capex spending by AMZN, MSFT, GOOGL, and other cloud giants will sustain through 2027, supporting semiconductor and equipment maker margins indefinitely. However, this thesis faces several pressure points. First, some traders openly acknowledge that Nvidia's circular investment pattern (where Nvidia funds startups like CoreWeave, Iren, and others that then buy Nvidia chips) creates a closed-loop that may not be sustainable at scale. Second, the capex cycle could peak faster than consensus expects if AI model training efficiency improves, reducing the need for exponential increases in compute capacity. Third, AMD's emergence as a viable alternative accelerates if supply constraints ease.

Nvidia's dominance in GPU supply remains total, but the CoreWeave relationship has drawn criticism as potentially artificial demand inflationThe rate at which prices rise across an economy.. Jim Cramer pushed back on the 'too late' thesis for AI winners, arguing data center growth remains in early innings despite recent stock moves. Wells Fargo revised CoreWeave price targets higher, reflecting the structural strength in data center utilization. Yet beneath the surface, some technical analysts note that semiconductor momentumThe empirical fact that winners keep winning over the medium term. has already hit 147% above 200-week moving averages at RSIRelative Strength Index - momentum oscillator on a 0-100 scale. extremes, suggesting near-term upside is increasingly priced in.

The key risk is visibility cliff: if 2026 capex growth disappoints or 2027 guidanceCompany-issued forecasts of future financial performance. shows deceleration, the multiple expansion that has driven valuations will reverse sharply. Companies like Broadcom, which supplies switches and optical components to data centers, could see earnings compression if network infrastructure spending normalises. Conversely, if AI training requirements accelerate (larger models, more inference compute), capex could overshoot consensus and lift all boats further.