Originally Posted by
Sethanor
you need to decide if you want a negative pressure or a positive pressure cooling system which will then dictate the amount of in- and outtake fans.
positive pressure: more intake fans than outtake fans -> overall a bit less cooling, but no problem if the airflow is good. way less dustproblems
negative pressure: more outtake fans than intake fans -> overall a bit more cooling, even if airflow isnt optimal. dust will gather faster
Personally, I'd take positive air pressure. Technically, negative provides more cooling if you exhaust as much hot air as you can in most cases, however, your computer becomes a dust magnet. While in positive air pressure, the case almost acts as a seal from dust. This can result in less cooling, but if you have a good case and your parts are running at fine/cool/stable temperatures, then why not just do positive?
also GPU temps of up to 80° for newer nvidia cards on 100% load is absolutly no problem as long as its not 24/7... 75° is perfectly normal at full load