The cheapest graphics card you can play it on is an NVIDIA GeForce 7100 / nForce 630i. But, according to the developers the recommended graphics card is an NVIDIA GeForce GTX 1060. Daemonical system requirements state that you will need at least 8 GB of RAM. In terms of game file size, you will need at least 2 GB of free disk space available. To play Daemonical you will need a minimum CPU equivalent to an Intel Pentium 4 2.00GHz. Whereas, an Intel Pentium 4 3.00GHz is recommended in order to run it.
Daemonical will run on PC system with Vista+ and upwards.