how to set my monitor properly?

[FLYING LI]

I have two OS on my computer:FreeBSD 4.7 & MS win98.I
have installed Nvidia driver for FreeBSD,and there is
two questions of X now.
1>
the desktop is smaller than my monitor's physical size
when i come into X of FreeBSD.if i adjust it well and
reboot to win98,the same phenomenon will happen.
2>
my monitor can display 800x600 at 100Hz at win98.but it
can only display 800x600 at 85Hz at FreeBSD.

help me please.thanks a lot!


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