Question 3 screens same refresh rate ?

Apr 22, 2021
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Hi Guys,
I'm using a GTX 1070 with 3 screens:
FHD 144hz 24' (running in 120hz)
FHD 60hz 24'
1680x1050 60hz 22'

If I turn off 1 of the screens no matter which one, my GPU runs on 139mhz on idle
but when all 3 screens are working my GPU clock jumps to 847mhz which making my GPU getting hotter on idle...
So if I work with 60hz or 120hz and 2 monitors everything is fine but 3 screens are my problem
is there any fix for that or am I doing something wrong?