The cryptocurrency craze is hitting yet another couple of waves with Bitcoin reaching a record $2900 USD in value, while Ethereum is climbing up as it doesn't require ASIC specific graphics cards. I've personally just written an article where I'm using 4 x different PCs with 11 x GPUs between them and it's estimated to make me $900 this month alone.
Secondly, AMD Radeon RX 400 and RX 500 series cards are flying off the shelf so fast that the RX 580 is being listed on Amazon for as high as $900. This is absolutely insane, as a GeForce GTX 1080 Ti costs less than $700, but loses to the RX 580 in cryptocurrency mining, especially Ethereum.
Now there's rumors that both AMD and NVIDIA are working on cryptocurrency-specific graphics cards that would not include display connectors, so you could just buy a handful - or boxes of them, and throw them into mining rigs. These cryptocurrency mining cards would ship with a much smaller 90-day warranty, and will be sold by AIB partners, and should be a little cheaper than traditional GeForce and Radeon graphics cards.
We'll have more on this as it happens.