I've had HD 7850 for 3 years and it worked fine all the time.
Now I decided to get a more powerful card and bought Sapphire 280 X Toxic. This new videocard made all my installed games crashed in 1-2 minutes of gameplay while old HD 7850 was working fine.
I got my money back (thought it was a specific card defect) and bought Power Color RX 480 8gb. But I got the same result - any game is crashing in 1-5 minutes after the start.
Windows 7 reinstalled.
Drivers reinstalled 5 times.
Bought a new PowerMan 1000 Watt power supply.
Switched GPU frequency from 1279 default to 1255 (since 1266 is AMD nominal I guess) and lesser.
Switched to default Wattman settings for a specific game (Witcher 3).
GPU temperature is about 65-70 when crashing.
Fans are rolling well.
No any error messages for Witcher 3 and Fallout 4.
Default Windows error message for MWO and Warcraft 3.
Full game stop for Dying Light.
Any suggestions to solve this?