ThatAfricanDude :
Please do, tell me what temps and performance you get because im planning on getting the same one
Apologies for the late reply - completely forgot to reply to this once i got it setup.
So i went with the Gigabytre RX 580 8GB and its been so much better than the Asus Dual OC 480 8GB - firstly its not crashed once in nearly 50hrs gaming. The Asus 480 crashed every 30 mins as it was too far overclocked (not by me - thats just how it comes).
I've been playing PUBG: Battlegrounds constantly on the Gigabyte RX580 8GB and it plays like a dream - lots of people have issues with this game as its resource heavy at the moment due to it been an Early Access but my CPU & GPU dont have any issues.
FPS
At the time of switching the 480 to the 580, i noticed the 580 was getting around 10 fps better on average than the 480 did. I'm saying at the time because they made some improvements to the game shortly after and how PCs handle it so it now gets much better fps.
Anyway to summarize i would defiantly recommend the Gigabyte 580 8GB. Next time i get a new GPU i will also be checking what AMD website recommend the max boost overclock speed is and confirm the 3rd party hasnt overclocked it past this like i found with Asus.