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I think you should be fine.well potentially an amd 6870, got an asus on order, but i heard good things about msi afterburner and dont wana miss out on something that might help oc later
you can use it on any card
Not totally true.
Asus voltage tweak cards tend to have a different VDC which Afterburner cannot alter. In those cases you have to use the Asus SmartDoctor utility.
You can add the VDC, like my Asus V2.
And that's generally the custom ones, like the V2.