In order for you to play Stellaris on Windows with minimal graphics settings, your computer must meet the following requirements
Operating System:
Windows® 10 Home 64 Bit
Processor (CPU):
Intel® iCore™ i3-530 or AMD® FX-6350
Memory (RAM):
4 GB RAM
Graphics Card:
Nvidia® GeForce™ GTX 460 or AMD® ATI Radeon™ HD 5870 (1GB VRAM), or AMD® Radeon™ RX Vega 11 or Intel® HD Graphics 4600
DirectX:
Version 9.0c
Network:
Broadband Internet connection
Storage:
10 GB available space
Sound Card:
Direct X 9.0c- compatible sound card
In order to play Stellaris on Windows with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Windows® 10 Home 64 Bit
Processor (CPU):
Intel® iCore™ i5-3570K or AMD® Ryzen™ 5 2400G
Memory (RAM):
4 GB RAM
Graphics Card:
Nvidia® GeForce™ GTX 560 Ti (1GB VRAM) or AMD® Radeon™ R7 370 (2 GB VRAM)
DirectX:
Version 12
Network:
Broadband Internet connection
Storage:
10 GB available space
Sound Card:
DirectX 9.0c-compatible sound card