The easiest way for those who want to be a cryptocurrency miner
AMD and Nvidia are the leading manufacturers
Radeon RX 5700 XT
Frequency: 1605 MHz to 1905 MHz
VRAM: GDDR6 - 8GB
https://www.amd.com/en/products/graphics/amd-radeon-rx-5700-xt
Nvidia RTX 2060 Super
Frequency: 1470 MHz to 1670 MHz
VRAM: GDDR6 - 8GB
https://www.nvidia.com/en-eu/geforce/graphics-cards/rtx-2060-super/
Nvidia GTX 1660 Ti
Frequency: 1500 MHz to 1770 MHz
VRAM: GDDR6 - 6GB
https://www.nvidia.com/en-eu/geforce/graphics-cards/gtx-1660-ti/
AMD Radeon VII
Frequency: 1400 MHz to 1800 MHz
VRAM: HBM2 - 16GB
https://www.amd.com/en/products/graphics/amd-radeon-vii
Nvidia RTX 2080 Ti
Frequency: 1350 MHz to 1635 MHz
VRAM: GDDR6 - 11GB
https://www.nvidia.com/en-eu/geforce/graphics-cards/rtx-2080-ti/