Why shouldn't I get the 280x?

Yes.

@TheCoryphaeus Why two threads for the same issue?

About the 300 series cards being re-brands...that is just a rumor. NOT confirmed. It is also speculated that the reason the cards were delayed from releasing this spring was that the share-holders demanded no more re-brands and AMD is therefor going to release all new cards based on the new architecture. And really, if they are re-brands, don't get pissy about it since Nvidia does the same shit.

Short answer: FreeSync

Shortest answer: