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I'll be using an EVGA Hadron case and some say use a reference card so it doesn't blow hot air inside, but others say its fine with open-design cards. This makes deciding very confusing
Yes, indeed one advantage with the reference cooler is that it channels the hot air out the back rather than cycling it around in the casing. The disadvantage is that it depends on a single fan trying to push air across from one end to the other, so it may be a little noisy with the fan having to work harder.
As for those non-reference open HSF design, they generally have better cooling capacity as they could have larger heatsink, and 2 or 3 fans circulating plenty of air through the heatsink. The disadvantage is that it circulates the hot air inside the casing, and so you need to ensure your casing have plenty of airflow to get the heat out of your casing.
If your casing have good airflow through it, I would say those non-reference open design would be a good choice, as you'll get better cooling performance and lower noise.
I own two Hadron Air Cases.
I went through 6 GPUs so far with selling and buying cards until i had what i wanted.
Luckily i always got my money back.
The coolest cards for the power are the GTX 980 Reference style.
Which is also present in the GTX 770 and up series.
Its able to utilize the blank area in front the PSU and the kick up to Draw air in.
Some of the EVGA with the enclosed heatsink do nice but the rest dump the hot air inside.
I have 2 swapped out 4pwm pin Quiet fans with the NT-06 PRO SilverStone
running 980 and fiance runs a 770 GTX we sitting at about 50-55C for CPU and 60-70C GPU temps
I had the New Twin Frozer Wont fit, and the old 7xx Twin raised my temps by 10 degrees of the same Flavor cards.
PCB on the Back allows to run things at 0 Tolerance
no PCB Covers you have to make sure there is space between components.