Okay guys, I would like to share something in this thread.





normal temperature in my old casing,

the temperature is approximate 75 celcius for both cards in idle. 100% Fanspeed.
NOW,
With such ventilation, when the graphic cards is in idle,
2nd GPU = 50 celcius
1st GPU = 70 celcius.
again, 100% fan speed.
So pratically, the "Ventilation" only works for second card where as the first card hardly get some air to get into it although it has a Slot of gap.
But processor temperature do decrease.
Conclusion:
You need a fan to either blow in at the Graphic card fan blower OR blow out at the end of the graphic card where the heat emit.