RX 480 FPS Drooped

[esakhelvi]

Hello Guys .My GPU msi rx 480 8gb
Cpu z420 e5-1660
8gb ram
In furmark 720 preset 1 mint test gpu tem max 80 .but my fps droop from 110 to 50-60 fps
But in game battlefield v on ultra fps is stable aroud 60
I have put another gpu sapphire rx 480 8gb in furmark 720 preset test fps is stable on 110 to the end
So pls tell me why my msi droop fps .there are no other issue in my gpu