That ‘depends’. Most of the crypto farms run on low cost motherboard/cpu combos with 8+ GPUs essentially connected via a single PCIe lane. If you wanted to do training or even inference on that, you would need to relocate those GPU’s to a more capable system and then limit the number of cards to a maximum of 4 cards per system or less. At which point if you are talking about cards with 8GB or less VRAM you have an expensive to run and set up system with 32GB VRAM and fairly low performance. That is why the higher 16GB+ cards are all disappearing.