The cheapest graphics card you can play it on is an NVIDIA GeForce GTX 970. But, according to the developers the recommended graphics card is an AMD Radeon RX Vega 64. To play End of Days you will need a minimum CPU equivalent to an Intel Core i5-4590. Whereas, an Intel Core i7-6900K is recommended in order to run it. End of Days system requirements state that you will need at least 4 GB of RAM. If possible, make sure your have 16 GB of RAM in order to run End of Days to its full potential.
End of Days will run on PC system with Win 7 SP1 and upwards.
