What does it mean if a computer has dual graphics cards?

Like in the Dell XPS 630 it has dual NVidia 8800GT 512MB cards.





Does that mean that it actually uses 1024MB for video or do they alternate or something?

What does it mean if a computer has dual graphics cards?
It means it has TWO graphics cards. Most likely, they are SLI'ed. If it is, then the computer is able to take the power of two graphics card and combine it into 1 super powerful card. Well, kinda. Its similar to the idea of multicore processors.
Reply:conecting two vga cards in the same device called sli technology and it means that ur getting the both ram in both vga cards and also u get the proccessing speed of the both cards
Reply:Nope still 512mb as the data from the 2nd card is cloned into the 1st it does however increase the processing power 2 fold.
Reply:Having 2 or more video cards means that those cards are connected and act as one card, so basically having two 512MB video cards is the same as having a 1024MB card
Reply:one of the best things of having dual graphics cards is u can have 2 monitors working at the same time browse the Internet on 1 monitor while watching TV on the other, When your mouse hits the end of the screen it continues on to the other screen, if you have xp or vista just connect a extra monitor to the other video card and you practically on the way.
Reply:Take a look at these links to get a better understanding of how Nvidia's SLI and ATI's crossfire works





http://en.wikipedia.org/wiki/ATI_CrossFi...





http://en.wikipedia.org/wiki/Scalable_Li...