2 monitors with integrated video card is it possible?

[AlexB81]

I have amd athlon 64x2 dual core 4600+ 2.4ghz 960mb ram
and graphic card is nvidia geforce 6100 integrated with just one output 15 pin.
I want add a monitor and see 1 desktop.I ve 1 monitor samsung 204b 1600x1200 and one philips 17".
If i buy a graphic card and i put it in white pci express slots it works?
I think above white slots i ve a black slot (AGP) i can put graphic card also there which is the difference.