I just realized that my gpu is getting hotter day by day and i screen shot this image maybe it could solve the problem
View: https://imgur.com/a/myOxHMU
View: https://imgur.com/a/myOxHMU
as you see the gpu clock is go up to 2800 mhz but i did not overclock the card and it says that in gpu z the default clock is only 2400 mhz.if it can go up to 2800 mhz it will show different gpu clock in gpu z.i nearly touch 85 degree gpu temp and 110 hotspot
View: https://imgur.com/a/myOxHMU
as you see the gpu clock is go up to 2800 mhz but i did not overclock the card and it says that in gpu z the default clock is only 2400 mhz.if it can go up to 2800 mhz it will show different gpu clock in gpu z.i nearly touch 85 degree gpu temp and 110 hotspot