The cheapest graphics card you can play it on is an NVIDIA GeForce 510. You will need at least 25 MB of free disk space to install Monolith. An Intel Pentium 4 2.00GHz CPU is required at a minimum to run Monolith. Monolith system requirements state that you will need at least 1 GB of RAM.
Monolith will run on PC system with Vista, 7, 8, 10 and upwards. Additionally it has a Linux version.