I wonder if this:
Resolves a sporadic system hang encountered with a single AMD Radeon HD 7000 Series GPU seen on X58 and X79 chipsets.
...means that they have fixed this:
http://my.opera.com/rejzor/blog/2012...en-very-slowly
They are mentioning HDMI Audio but only for Ubuntu so that doesn't apply for me. But the above one does HD7000+X58 chipset combo... will have to try it out afternoon.