Working through this issue myself at the moment.
Basically, some of AMD's drivers work and some certainly don't (are not fully compatible with their users machines)
Although I am new here, I have spent vast amounts of time over the years working through issues with Drivers and VBIOS for AMD related products.
Watching with interest for any community advice for driver related issues other than denial
Well i solve vega 3 issue. The problem was hdmi cable. This cable work correctly just after i buy pc but when i connect r9 270 looks like cable get failure and work only without drives what mean less performance/transfer. I buy new one and vega 3 work correctly with new drives but r9 270 still dont work with drivers. I guess it can be hdmi port issue
This is why computers and technology in general are so much fun to work with.
From the depths of despair to a huge sence of achievment.
I actually had problems with incompatable RAM causing a black screen one time.
That was interesting
I also managed to get my laptop running on one of the later versions of Adrenalin drivers.
They don't all work on my machine though.
Will do a more in depth reply here when I have more time.