Try the solution of another one in here, @NeveroddoreveNx
Try going to your AMD Radeon Settings (rightclick on desktop to find it)
Go to Preferences in the buttom of the screen and reset to factory default…
Don’t know why it should help… but @NeveroddoreveNx did the same on the same chip as yours (but different model) and it just magically jumped from exactly your score to passed without problems.
I have the same GPU as you (although mine is the 7970, of which yours is a rebranded version of) and I have no problems at all… got a score around 1550
Edit: Here’s the thread if you guys wanna see it @LARGOFARBURN & @Moadeebe