Matt Krantz, at the newspaper, said Nvidia shares aren't for those that get frit. Its share price has shown huge rises and huge losses.
The risk of the shares, he maintains, is that in any given year it could be up 151 per cent or down 90.9 per cent.
He said Nvidia's share price shows "insane volatility" and questions of competition and regulatory concerns should make all but day traders cautious.
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* NVDA stock closed on Friday at $37.50. Its 52 week low was $17.17.