have you noticed one of those video says problem solved with amd driver update? which beta version are you using? remember these are BETA for a reason, they're awesome but still in beta. most games don't official support eyefinity, it's that AMD has done a decent job of implementing it. Still, I would say try running gpu-z or similar logging software in background and after a crash open the log and look at the last entry for the temps and other entries at the time it crashed.