@Uhrwerk: sorry, I didn't see you replied...
I'm using an Intel i7 (4770k) with 8 threads (4 cores) running at 3.5ghz each.
My graphics card is an AMD Radeon HD 7850 (in case that's important, too).
this application uses
~8-10% (
64-80% of one core or
2.24-2.8ghz):
#include <acknex.h>
void main()
{
wait(1);
fps_max = 60;
video_set(sys_metrics(0) * .5, sys_metrics(1) * .5, 0, 2);
}