80mm vs 120mm

It's all gonna depend on how many cfm's the fans are pushing through. Oh and case 2 can take 2 80mm in the front you would just have to buy a second one and stick it in there. Just make sure if you get that second case, get a fan in the back it doesn't come with one for it. Normally 120mm fans are better since they push more air through, but like in that first one you can put 2 80mm in the front and 2 80mm in the back, I would go with the first one, no real reason why.
 
fyi, those cases look so good.....I might go and buy the first one (I like it better) XD and btw i don't really think it matters, but ask yourself this, "Would I want to push more cold air in, or more hot air out?" (In my expirence, the front fans are the intake ones, but I've seen setups where its the other way around.)
 
thats the main question i was trying to figure out; which is better: sucking more cold air in, or blowing more hot out?

I am also going to buy the first case. I was actually going to drive over to their office today, but found out that they don't support walk-in customers. Fortunately shipping is only $10 instead of the only case I found suitable on newegg for $17 shipping.
 
Blowing air out is typically better, at least from what I've seen with my cases. And for the best size, 120mm is the best choice. They can push MUCH more air at lower revs. Of course, though, not all 120mm fans are better than 80mm.
 
Unfortunately, the case I'm getting only fits 2x80mm rear. In this situation, like maggot mentioned, could I simply suck in from the back with the 80mm's, and blow out the front with the single 120mm (with proper efficiency, of course)?

Fans:
http://www.newegg.com/Product/Product.asp?item=N82E16811999127
http://www.newegg.com/Product/Product.asp?item=N82E16835150007


EDIT: I think I'll just play around with intake/output once I get the system running. Maybe I'll cut into the case to put a fan on top, or see if I can mod a 120mm into the rear. ... or maybe I'm worrying too much. haha :P
 
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Actually, I think both play a vital role, but I belive the intake is a little more important because (I think…) the tempature can be cooled faster with more cold air in then trying to push it all out. On my case, I got sooo many fans, 120mm in the back for output, 2 80mm fans in front for intake, 1 80mm fan on the door for intake (because i've noticed that I get a draft in sometimes from my roomdoor which hits my pcdoor, which is cooler than the temp in my room, and one 80mm fan on the top of the case for output, and thats not even counting the vidcard fans/hs, the cpufan/hs, or the psu fans. But thats just me. [also note this is on my oc'd system (CeleronD336) w/ 2 nVidia 7600GTs (sli mode...duh...)] Crazy eh? If i didn't have those, the temp inside is 90C+, but w/ them its only 60c+. (I also have them REALLY high) :rolleyes:
 
WHEN EXHAUST LARGER THAN INTAKE:
it creates vacumm inside the case since more air are sucking out of the case then getting into it. Once vacumm is created, more air will be sucked in from the gaps of the case to equalized the air flow between exhaust and intake. The inside temp will be lower since more hot air is pushing out of the case.

WHEN INTAKE IS LARGER THAN THE EXHAUST
more cold air is sucking into the case, but less hot air getting out of the case. Since the exhaust rate is slower than the intake rate. the excessive air inside the case will circulate inside the case and some air will draw back to the front. it will slow down the intake airflow. also less hot air will be push out.

the optimal soultion will be bigger exhaust fan mounted on the higher position of the case since hot air flows on top and smaller intake mounts at the bottom for cold air
 
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