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How to decide on a case for air cooling (warning - pics) - Page 104

post #1031 of 2110
Wait why cut out the rear mesh
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post #1032 of 2110
HUGE increase in airflow. The mesh stops quite a bit of air from being able to freely escape. You'll experience a major increase in CFM and decrease in noise. thumb.gif Check out the Nibbler Club in my sig for more info. thumb.gif
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post #1033 of 2110
thanks, looks like im going positive case and going to buy a nibbler tomorrow.
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post #1034 of 2110
Quote:
Originally Posted by WolfssFang View Post

thanks, looks like im going positive case and going to buy a nibbler tomorrow.

Sounds good. Take your time with the nibbler. IMO it's best to make the cuts with the case empty. The 'nibbles' are small and can easily fall behind something like the PSU or m/b. Cheap wire cutters may also be needed to make a starting hole for the Nibbler.
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post #1035 of 2110
Quote:
Originally Posted by kevindd992002 View Post

Ok. But what happens to the hot air that's exhausted out from the heatsink assembly of the video card into the mid area of the case if I raise my mid-case fan directly blowing in that area? Won't it be counter-productive because hot air (from the video card heatsink) and cooler air (from the mid-case TY140) are colliding each other? In this case, I think the cooler air has more velocity and will push the hot air back to the heatsink which could have a negative impact. What do you think?
Is it also fine if I get the PWM signal of the video card and make that as the PWM signal for both the bottom intake and mid-case fan? Or is it recommended to keep the bottom intake fan at low speed?

Ehume, any ideas?
post #1036 of 2110
Quote:
Originally Posted by kevindd992002 View Post

Ehume, any ideas?

what you are describing is recirculation of hot exhaust air. it's not ideal, however when you inject cool air (TY140) it mixes with the hot exhaust air of the GPU and makes the average air temp cooler then the raw exhaust air. you DO recirculate back SOME of the heat, but the amount of heat recirculated depends on how well your airflow design is inside the case. if you have good airflow inside the case, the recirculated heat is kept to a minimal and the effect is negligible. however if you have poor airflow inside the case where the heat is trapped in the case, then you have a really big problem because the thermal short circuit created by the internal exhaust GPU will simply keep getting hotter.

this is the main reason why ehume recommends cutting out the rear grill with a nibbler to reduce airflow resistance so you don't have a heat pocket developing where you don't want heat to hang around. ehume believes in "positive air flow" regardless of pressure, however, personally i'm more of a positive pressure type of person and prefer to have some pressure so i can direct the airflow exactly where i want it to go by strategically placing exhaust ports. both methods work well for cooling, it's just a difference in opinion / methodology. ehume's method prevents any heat build up, my method accelerates airflow at strategic locations where heat tend to gather/linger w/o additional fans.
post #1037 of 2110
Quote:
Originally Posted by psyclum View Post

what you are describing is recirculation of hot exhaust air. it's not ideal, however when you inject cool air (TY140) it mixes with the hot exhaust air of the GPU and makes the average air temp cooler then the raw exhaust air. you DO recirculate back SOME of the heat, but the amount of heat recirculated depends on how well your airflow design is inside the case. if you have good airflow inside the case, the recirculated heat is kept to a minimal and the effect is negligible. however if you have poor airflow inside the case where the heat is trapped in the case, then you have a really big problem because the thermal short circuit created by the internal exhaust GPU will simply keep getting hotter.
this is the main reason why ehume recommends cutting out the rear grill with a nibbler to reduce airflow resistance so you don't have a heat pocket developing where you don't want heat to hang around. ehume believes in "positive air flow" regardless of pressure, however, personally i'm more of a positive pressure type of person and prefer to have some pressure so i can direct the airflow exactly where i want it to go by strategically placing exhaust ports. both methods work well for cooling, it's just a difference in opinion / methodology. ehume's method prevents any heat build up, my method accelerates airflow at strategic locations where heat tend to gather/linger w/o additional fans.

Thanks for the reply. Again, this is my cases' setup:

L1270040.jpg

It already has almost all of ehume's suggestions with positive airflow. My only concern now is whether to raise my TY140 or not as suggested by solsamurai. I'm just curious on the comments of other users regarding this. So if I understand you right, you agree with this suggestion?
post #1038 of 2110
I'd raise the fan. It will help with the graphics card temps as well as move it further from the bottom fan, so that the two aren't interfering with each other. As it is now, they're blowing air at exactly the same place, but from different directions, which could slow it down. An inch or two would really help get more air moving and help to better push air past the graphics card..

You could probably test this by running 5-10 minutes of your favorite GPU benchmark or stressing program, move the fan up, then repeat. This would give you concrete data as to which is better, and would take less than 30 minutes and use a ziptie or two. Let us know if you test it, I'd be curious as to how much difference it makes thumb.gif
post #1039 of 2110
Quote:
Originally Posted by Molybdenum View Post

I'd raise the fan. It will help with the graphics card temps as well as move it further from the bottom fan, so that the two aren't interfering with each other. As it is now, they're blowing air at exactly the same place, but from different directions, which could slow it down. An inch or two would really help get more air moving and help to better push air past the graphics card..
You could probably test this by running 5-10 minutes of your favorite GPU benchmark or stressing program, move the fan up, then repeat. This would give you concrete data as to which is better, and would take less than 30 minutes and use a ziptie or two. Let us know if you test it, I'd be curious as to how much difference it makes thumb.gif

Right smile.gif I can test it as early as next week. I'll post my findings by then. Thanks!
post #1040 of 2110
Sounds good. I agree with a quick ziptie test first. thumb.gif
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