I know this is a very old post but the HD 7990 and HD 7970x2 both exist still,the HD 7990 is made by POWERCOLOR and the HD 7970x2 is made by HIS! Both are on Newegg.com!
The fact the cards exist wasn't really in dispute, just that they aren't official SKU's of AMD.
And in the interest of completeness, Club3D and VTX3D also have 7990's. Both based on PC's TUL design
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