I'm planning to crossfire my msi r7850 p.e for multi display setup. I'm using the fractal design defini mini and I was wondering if I should use aftermarket cooling design card or reference card for the top one. There is a small gap for air flow and also I will be installing a fan on the side vent. What temps should I be expecting? Room temp is at 31 degrees Celsius. Also changing both my intake fan to scythe gentle typhoons next week.