Hi just another hardware question...

Just about to buy one of these cards.
I have read many reviews and descriptions but still need these answering.

When it says real time, does this just mean that when u ad say a transition and play ur movie it will run operfect as you play it?
(I ask this, as my machine already does?)

When you then export does the card make a difference, and if so HOW MUCH?

we talking rendering twice as quick?

cheers
John