You can have a look on the minimum or recommended requirements for Elite: Dangerous, because that game from Frontier uses the same engine. Do know that these are only an indication, and not final for Planet Coaster, as the game is still in development, and the engine of the game undergoes improvements ass well, that may lead to higher system requirements for Planet Coaster compared to Elite: Dangerous.
Elite: Dangerous - Windows minimum hardware specification:
- OS: Windows 7, Windows 8
- Processor: Quad Core CPU (4 x 2Ghz)
- Memory: 4 GB RAM
- Graphics: Nvidia GTX 260 / ATI 4870HD
- DirectX: Version 11
- Network Broadband Internet Connection
- Hard Drive: 7 GB available space
Elite: Dangerous - Windows recommended hardware specification:
- OS: Windows 7, Windows 8
- Processor: Intel Core i7-3770K Quad Core CPU or better / AMD FX 4350 Quad Core CPU or better
- Memory: 8 GB RAM
- Graphics: Nvidia GTX 770 / AMD Radeon R9 280X
- DirectX: Version 11
- Network Broadband Internet Connection
- Hard Drive: 7 GB available space
Source:
Frontier Store