bignastyid :
Find out what specific model the i5 is and what resolution and settings are you trying/wanting to run? Ark is poorly optimized so it takes a fairly powerful system to run it well.
Okay so my intel core is a i5 7400 kaby lake. And my gtx has 2gb.
I am currently running the game on 1920 x 1080
World tile buffer: high
View distance: high
Anti-aliasing: epic
Post processing: medium
General shadows :low
Terrain shadows: epic
Textures: medium
High quality anisotropic flitering is on
High quality LODs is on
This is all i could say about game settings