NVIDIA looks close to the top of an AI bubble, with a two-year megaphone pattern signaling exhaustion of growth. Such expanding, volatile patterns historically don't end painlessly. Its roughly 22x valuation on a $4.8 trillion market cap and $216 billion profit is approaching Cisco's roughly 30x in 2000. Nvidia just raised $25 billion in debt, drawing $85 billion of orders. x.com x.com