video cards

how is 2 video cards better than 1...does it make the graphics better

more monitors able to connect, more memory, i think thats it

Yes, but not twice as good - and only if the software supports it.

A much better bet is to buy a single card from the range up - it will usually be cheaper and perform better.

PS. In SLI mode, half of the Video memory is unused.

have a look at:

http://www.slizone.com/page/slizone_learn.html

pretty well explained