The original Stellaris requirements were pretty optimistic. They have recently been updated. Now to run Stellaris smoothly you will require a Phenom II X4 850 or Intel i3 2100 processor. The GPU required to reach Stellaris high graphics settings and reliable FPS at 1080p resolution would be either a AMD HD 6850 or a Nvidia GTX 560 Ti. The Stellaris system memory requirement is 4GB.
Stellaris is a 4X grand strategy game set in the depths of space. Space exploration is at the core of Stellaris, which is from the same stable as Crusader Kings and Europa Universalis IV. Stellaris Leviathans, expands on the previous game adding heaps of new content including giant space creatures