"Display driver stopped responding and has recovered" amd windows 10

I ran Claymore (v 9.3) but after a few minutes it showed a temperature of 75c and then everything on screen disappeared. Just all blue. I rebooted and tried running claymore again, but now everytime it just doesn't start mining. It shows the message (pls see attachment). And on bottom right it says "Display driver stopped responding and has recovered".

I have set 16 gb virtural memory
Then TdrDelay Qword set to 8 in registry
and all other settings tried

I have 4x sapphire nitro+ rx 480 cards
asus b250f mobo
4gb hyperx ram
90gb ssd
windows 10

Please Help.