The RAMDAC is the digital-to-analog converter; this is what the card uses to
feed the analog port you plug your monitor into. The faster this is, the
higher the resolution and higher the refresh rate the video card is capable
of outputting. You can't change it's speed at all. Most new cards seem to
have a 400MHz one as standard.
Correction, PC connection does not have these cards.
Jeff B
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