Can a power supply go up side down?

MutatedPixel

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Oct 5, 2014
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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.
 
Thanks for the quick responce! What if I were to exceed the 300 watts?(like adding a new hard drive for instance) Would any parts be damaged, or would it just shut down or something else