LoL, You made my day ^^.
Are you really reading on hardwaresites ? If yes, then you should try to understand what there is written ;).
The R means rebranded ? Then tell me please which card the R9 Fury, R9 Fury Nano and R9 Fury X are before they were rebranded ?
The HD5870 was nice when it was released, but do you really think it can make the same performance like the current amd and nvidia cards at the same class ?
Also my HD7970ghz is a lot faster then the HD5870 on DX9,10+11 even when not more then 1gb of V-Ram was used.