Can I get a good animation with a video mode with arbitrary frequency ?
There is no way to get a perfect animation without using a video mode with the same game refresh rate. You will get the tearing effect or a not smooth animation from some frames skipped or displayed too long. For example, suppose to use a 70 Hz video mode with a 60 Hz game. You can display every frame for 1/60 of second and get the tearing effect. Alternatively you can display every frame for 1/70 of second, but after 7 frame you need to display a frame for 2/70 of second to synchronize with the original game speed. The only exception is for frequencies which are multiplier of the original game refresh rate.
