PSU 1000w
CPU i3-2130
GPU 7850 x 2 (plugged into Motherboard without risers cable)
MB Asrock Extreme 4 (2x 16x pcie, 2x 1x pcie)
Ram 8GB DDR3 1600
HDD 500GB 7200RPM

I have concern about the GPU plugged into motherboard as I will be opening it for 24H, will it burn my motherboard in the long run?