It is possible that your card was already failing when you tried to update the drivers. If your card has the same symptoms on another computer, it probably went bad.
If it still under Warranty, Good luck with Sapphire. Very poor Warranty and difficult to get an RMA. I believe they have a two year Warranty.
Here is another thread concerning a Sapphire R9 doing the something similar and his experience with Sapphire Support: Sudden death of Sapphire R9 Fury?
Wow... 3 month after warranty
Dont be sad, you would not have got anything from Sapphire in the first place
My Fury still is under warranty and died a similar way, but Sapphire tells me to just send it back to the seller of the Card, eventhough they cant replace it.