psu at bottom

[rishy]

Been out of the building game for some time, just one thing i need to ask why has the power supply in most cases moved from the top to the bottom

 

[olivier renault]

Heat rising up, so less heat on the PSU. PSU's generally don't like heat.

Best turn the PSU upside down if you have the option, if bottom mounted, and if you put the case on the floor, so the PSU fan doesn't suck up all the grime.

Turning the PSU upside down can make the cabling shorter (since cables will be on the floor of the case and have to travel a little bit more), and can often blocks a bottom mounted case fan if it is too close to the PSU.