So this happened to me too, I think it's probably just the update notifier crashing the driver in an unclean way, Anyways I updated to the new beta, everything seems fine.
Edit: Confirming this, the update notifier causes the bluescreen, happened on my dual r9 290x system too just now.
Same...
Okay so after a full load test (Running a Cryptocoin miner on both cards so theyre both at 100% use)
I get a 67 Celsius on the top card and a 64 on the bottom one.
Keep in mind that I am liquid cooling my cpu and that I have a massive case with enough fans to create a hovercraft with the lift...
Im running two of them, now I have insane airflow in my case so after playing for a few hours Im at around 55 and 59, 59 being the one on top having it's fans covered up.
I tried it with and without soundcards... bares no effect, and if you use a dpc latency monitor you will see that when crossfire is enabled the dpc latency just skyrockets.
I have suffered from this issue but, 14.1 drivers and beta 9.2 drivers worked just well.
So I'm running the 14.1 drivers currently and I'm not experiencing this at all.
Additionally every single time I've had crackling it was accompanied with the dpc latency skyrocketing, causing a lot of lag...