Seasteader system requirements state that you will need at least 8 GB of RAM. Provided that you have at least an NVIDIA GeForce 8500 GT graphics card you can play the game. An Intel Core 2 Quad Q9000 CPU is required at a minimum to run Seasteader. In terms of game file size, you will need at least 1 GB of free disk space available.
Seasteader will run on PC system with Windows 7 and upwards.