Durango has always had 8 gigs GDDR5, sony matched specs

[maximrace]

According to neogaf user and blizzard cinematic animator Vustadumas the next xbox has always had 8 gigs of GDDR5. It was sony who changed specs to match, not the other way around.

 

Source: http://www.neogaf.com/forum/showpost.php?p=57028434&postcount=3192