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Short answer is Yes. What card do you have now, and what are you upgrading to?

Yes.

Well, you should always reinstall drivers , doesnt take long, and will be less problems that way,

You should uninstall the drivers that are already installed; if you're using Windows, you can do that pretty easily from the "Add/Remove a Program" window. Only then install the new drivers.

Yes, you have to install the driver for it

Quick answer Yes, long answer yeeeeeeeeeeeeeeeeeeees