i see. i've actually read a little bit ago that sli doesn't give too much of a performance increase.
It does depend on the game but these days a lot of titles do take advantage of dual cards and if you have one that doesn't by default it's usually possible to force it to via the Nvidia control panel.
last question then, can i run an ati and an nvidea card at the same time for dual monitors, or would the drivers be incompatible or something to that effect?
Only if you are using XP or W7, Vista 32/64 does not allow that.