Since Ethereum is ASIC resistant (in the current economic sense), most mining is done through (many) GPUs. $AMD recently posted earnings and their CEO (Lisa Su) stated the company has seen increased demand from the crypto mining sphere, but that they don't view this market as a long-term growth driver at this point.
$NVDA is taking a different stance and is looking to release cards specifically geared towards mining cryptocurrencies. An example is the Asus MINING-P106-6G which utilizes the NVIDIA P106-100 graphics engine and comes with 6GB GDDR5 memory.
It'll be interesting to to watch trends develop and see if AMD will change their minds. In the long haul this won't affect Ethereum too much as it's slowly but surely moving from PoW (Proof of Work) to Proof of Stake