Hello,
I have one of these Silverstone Raven cases (RV01) which have the motherboard tray rotated at 90 degrees with the goal to improve natural heat conduction. All of the PCI cards are vertical and so is the CPU cooler.

I am really wondering how to position my Power Supply unit though (with the fan upwards or downwards?)
1. Clearly you can see there are holes and dust filter on the very bottom as well as rubberized bumps for the PSU - a design saying
"Put me with the fan downwards so I can suck cold air through the dust filter".
2. On the other hand if I put the PSU with the fan pointing upwards, then it might prove very beneficial for the whole vertical airflow model.
This will create more way for the 180mm fan above the PSU to suck fresh air through the PSU itself (when the PSU fan is not running). Unfortunately when the PSU fan is running it will obstruct the airflow as PSU fans are positioned to suck air and not exhaust it (although nothing stops me from opening the PSU and reversing the fan).
I've heard people like Tiny Tom Logan say "I always try to put the PSU with the fan upwards". Never understood why. (Although he wasn't talking for a 90 degrees case though).
Any suggestions?
I have one of these Silverstone Raven cases (RV01) which have the motherboard tray rotated at 90 degrees with the goal to improve natural heat conduction. All of the PCI cards are vertical and so is the CPU cooler.

I am really wondering how to position my Power Supply unit though (with the fan upwards or downwards?)
1. Clearly you can see there are holes and dust filter on the very bottom as well as rubberized bumps for the PSU - a design saying
"Put me with the fan downwards so I can suck cold air through the dust filter".
2. On the other hand if I put the PSU with the fan pointing upwards, then it might prove very beneficial for the whole vertical airflow model.
This will create more way for the 180mm fan above the PSU to suck fresh air through the PSU itself (when the PSU fan is not running). Unfortunately when the PSU fan is running it will obstruct the airflow as PSU fans are positioned to suck air and not exhaust it (although nothing stops me from opening the PSU and reversing the fan).
I've heard people like Tiny Tom Logan say "I always try to put the PSU with the fan upwards". Never understood why. (Although he wasn't talking for a 90 degrees case though).
Any suggestions?