I have a GX-781 and I want to replace my original power supply for a more powerful, modular and quiet one for an future RTX. It's a 500W Lite-On PS-7501-5. It is placed high up and as you can see in the picture the ventilation is at the front and rear. I wanted a Corsair RM750x 750 W but the ventilation is above. How to do ? Thanks.