Cramer: Bitcoin-ethereum craze boosts Nvidia and AMD, but it shouldn't By: CNBC.com News June 23, 2017 at 11:23 AM EDT There are many reasons to buy shares of those chipmakers, but a play on cryptocurrencies is not one of them, Jim Cramer says. Read More >> Related Stocks: Adv Micro Devices Bitcoin (Bitstamp) Bitcoin Composite NVIDIA Corp