Nvidia is rocking.

Nvidia (NVDA - Get Report) shares have been on fire this year to the tune of 61%, for a reason.

TheStreet's founder and Action Alerts PLUS portfolio manager Jim Cramer said Nvidia offers an ecosystem and is far ahead in artificial intelligence, machine learning and autonomous driving.

Cramer said the stock should be bought when it drops. Shares rose 1.4% to $168.84 early Friday afternoon.

Meanwhile, here is what TheStreet's top tech columnist Eric Jhonsa had to say about cryptocurrency. 

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