AVS Special Member
Join Date: Jan 2007
Location: Toronto, ON Canada
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LOL I don't doubt you...at all. What I'm saying is, despite the name change, Curacao is Pitcairn. There may be some clock differences on the newer cards or something but that's no different than clock differences on the same model number card that exist from manufacturer to manufacturer or from model to model even (like Black Edition, OC edition, etc.).
Are you using the latest version of GPU-Z? The latest version should indicate an R9 270/270X as Curacao but they may have decided not to bother.
In short Curacao is] Pitcairn.
The latest version of GPU-Z even mentions an item that shows them that way:
"•Added CHiL8214 voltage monitoring for Pitcairn/Curacao cards"