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Reference cards From AMD are to AMD specs ,Either Sapphire or Diamond makes them ,Then sells them bulk to ASUS,MSI ,Power Cooler/TUL,XFX They all are the same.. also those manufactures just slap a fan shroud decal on them to distinguish them from the rest.Now for cards with say that XFX Black Edition that has better parts like vmr,caps ect....beefed up basically from the AMD reference.And to answer the question why ?Well AMD /ATI have always done it this way,Ounce the first batch gets sold then the Likes of Sapphire/ASUS/TUL/XFX have it in the contracts to make their own pcb `s.......
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