Investors are desperate to know if the $3 trillion Nvidia bubble is about to pop

• Investors are heading into Nvidia's annual shareholder meeting this week much less bullish.
• The chip giant has suffered a $431 billion wipeout since Friday, after a rally reminiscent of the dot-com boom.
• After growing by $3 trillion and then losing hundreds of billions, investors will be asking: is this a crash?

When Cisco became the world's most valuable company in March 2000, celebrations were short-lived.

The dot-com bubble had reached its limit, and despite previous forecasts that the Silicon Valley giant's hardware was vital to the internet's future, its value crashed 80% within the next two years.