I have a bit of a problem. I have a HP pavilion p7 1410 and I'm going to get a evga gtx 750 ti and because its rated for 300 watts and I have a 300 watt psu so I'm going to get a power supply. I decided to get the corsair cx430m but on the website I realized that the fan is on the top and my current psu has a vent on the back, not on the top or bottem so if i wanted the airflow to be right it would have to be up side down so I was wondering if it is possible for it to be upside down.