HD 7870 Myst drivers and PSU

CrushIce

Honorable
May 15, 2012
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I just purchased the Powercolor HD 7870 Myst edition from Newegg for $209 and I have 2 questions about it.

The first is that I currently have a HD 7770 with CCC 13.2 Beta drivers. Can I just swap out the cards and everything will be good to go, or do I have to uninstall/reinstall the drivers before/after installing the card? I haven't upgraded my GPU in a while so that's why I wanted to know if these drivers were compatible.

Now my second question is that I hear the 7870 Myst edition uses a lot of power and I was wondering if my Corsair TX550M PSU is enough to power it. Thanks beforehand for the help.