video gamma

Hello again. My next question is about video gamma.
The manual says it is not supported by each video card.
So my question is: What will happen if I would use the video gamma var on a card that does not support video gamma. I hope the engine will not crash? Or does the video card only ignore the video gamma command?

I highly doubt that anyone these days uses a graphics card so old it cannot perform gamma correction.

Okay, that's an answer. Thx.