Why do some games use your CPU far more than your GPU? - Quora
HoI 4 is designed for future GPUs | Page 3 | Paradox Interactive Forums
does this game run better on AMD cpu ? :: Hearts of Iron IV General Discussions
Poor performance with low CPU usage | Paradox Interactive Forums
Is the Hearts of Iron 3 still worth buying? I have Hearts of Iron 4 and have played about 100-200 hours. - Quora
Which is more important to properly run HOI4(late game)?CPU vs GPU? : r/paradoxplaza
Review: Hearts of Iron III (PC) – Diehard GameFAN
Which is more important to properly run HOI4(late game)?CPU vs GPU? : r/paradoxplaza
ZOTAC GT 640 Zone Edition - Bjorn3D.com
I don't think this game is very well optimized. It mostly uses a single core of my quad-core CPU and slows down a lot during mid-game. Has anyone else noticed this issue? :
ZOTAC GT 640 Zone Edition - Bjorn3D.com
Review: Hearts of Iron III (PC) – Diehard GameFAN
HOI3 vs. HOI4 comparison screenshots : r/paradoxplaza
Hearts of Iron III System Requirements - Can I Run It? - PCGameBenchmark