I would first look at both psu 12 volt rails " hwinfo64 will lists these as their min,average,max " and make sure it doesn't vary more then 5% of 12 volts and also run a memtest
What drivers are you using?
What's your system spec and OS?
Do other games or benchmarks crash?
Win 7 64bit. AMD 9590, Asus Crosshair V Formula Z. Dual MSI 290x Lightning. 32 GB of 1866.
Latest Radeon Setting driver.
Nothing else causes a crash like this one. At least not anything else I've tried.
Been playing Vermintide, and it plays surprisingly well with no hiccups or crashes. Crossfire shows the typical background flicker, but everything else is pristine. Although it is possible Vermintide doesn't push the GPUs fully or there's another bottleneck.