Why is this resolution "inaccessible"?

[Luca Dionisi]

On 1/17/06, Peter Jay Salzman <p at dirac.org> wrote:
> How is it possible that 320x200 needs a dotclock of 100 GHz?  How can I get

Isn't that due to a dot clock too high used by the video card?
If a card uses a high dot clock, and the mode has a low resolution, then
the rate of vertical and horizontal sync goes very high. And the monitor
could deny this.
Well... ehm... if I recall right.
I'm definitely not sure.

Luca