Hello,(I apologize for my bad english)
I have an XFX radeon 7970. And it goes in a black screen moment it crosses 70 degreesish. The screen goes black but the PC is still on because i can hear it and lights n stuff are on but can't do anything. and i have to manually restart. Just assembled the PC around 2 weeks ago. Drivers are all up2date. The ventilation is all good. For the first week it worked fine. I tried running MSI stress test and it reboots after it hits 65-70 degrees too. Any Help guys?