EEVEE Rendering doesn't use 100% cpu core?

My cpu is E5 with 20 cores, when I render with cycles , it use 100% cpu ,
but when I render with EEVEE, it just use 6% cpu ,
Can I speed it up with 100% cpu ?

It says “Eevee is Blender’s realtime render engine built within Blender using OpenGL focused on speed and interactivity…” on documentation:

So Eevee is using graphics card to make all heavy lifting.

Thank you, maybe I should use a better graphics card

I don’t know any statistics, but yes pretty modern gaming card should suffice.

But then again, I don’t think the most high-end card would either be the best buy for this, eg. most expensive Nvidia 20-serie GTX cards, would be over do. Better with 1060 GTX or something.