Sunless Skies currently has the following system requirements.
OS: Windows 7, Mac OS X 10.9+, Ubuntu 12.04+, SteamOS+
Processor: Intel Pentium 2Ghz or AMD equivalent
Memory: 4 GB RAM
Graphics: DX9 (shader model 3.0) or DX11 with feature level 9.3 capabilities
Storage: 4500 MB available space
Sound Card: DirectX 9.0c compatible