So, dual-coreing is being used in graphic cards too nowadays?
No. The technique used by NVidia and ATI is to connect TWO CARDS via cables or whatever, so they can *both* work on one thing.
I did not say "task" though, because that *could* be wrong, as like in dual-cores.
The thing about tasks is, that a program can contain *Üseveral* tasks, so a dual-core processor might decide to gibve one task to the one core and the other to the other core. Depending, how long one of both needs for the task, it could be that one of them has to wait for the other one.
Same could be with two connected graphic cards, but I'm not that sure about it. I actually don't know much about programming graphics cards.
Look at this site, its German version is quite good, maybe it can help you ?
http://www.tomshardware.com/ 
