Case Fans Cycling Internal Air

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PlasmaQuasar

PlasmaQuasar

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Sep 9, 2014
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Hey guys, so I recently built a new school/gaming PC. My problem is that the case is blowing air out the top of the front panel, and cycling some of the hot internal air. My configuration is an h115i pro mounted on the front sucking air in, two 140s on the top also sucking air in, and a single 140 in the back for exhaust.

Case: Cooler Master MC500P
GPU: Gigabyte GTX 1080 8GB overclocked edition
CPU: Ryzen 5 2600
RAM: G Skill Ripjawz 5 2×16Gb

All fans are either stock case fans or stock cooler fans.

Also note when the CPU cooler is mounted on the front like it is, there is space above it for HDDs. When I moved them from the bottom of the case to there, temps went down. I'm just trying to figure out whether this air cycling is normal, and if not, how to fix it.

Thank you guys!

By the way the PC is actually performing well despite this issue, placed high on multiple benchmarks.
 
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jsmithepa

jsmithepa

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Jun 14, 2014
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Recycling hot air normal? You are not understanding the basics. Needs COOL air in, exhaust HOT air out, no compromise.

U got too many in-fans and not enough out-fans. A little positive pressure is good but too much and you are forcing out air where they don't need to go. This is the first thing to fix.

^What countmike says. Hot air naturally wants to rise, help it, don't fight it.
 
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PlasmaQuasar

PlasmaQuasar

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Sep 9, 2014
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I understand the positive pressure thing, but I have no space on the bottom for intake. The only spots for fans are the front (2x140 or 3x120), top (2 120s or 140s), and back (1 120 or 140). If I switch the top to intake, I'd have negative pressure because only two rad fans would be being used for intake.
 
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CountMike

CountMike

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Oct 31, 2015
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Whole idea is to have as much air flow to cover as much and as many components inside the case as possible. Positive or negative pressure are just minor components of it. It's purported that some positive pressure in the case helps so that dust doesn't accumulate inside so much but doesn't stop it, only inlet filters can do that.
Modern cases are not made airtight so fan input and output ratio would have to be greatly exaggerated to achieve any.
 
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PlasmaQuasar

PlasmaQuasar

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Sep 9, 2014
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So I may have found a solution, but I still have to test it with the other fans maxed out. Essentially I made the exhaust fan in the back run on 100% at all times, which is totally fine as its a stock case fan anyways and its pretty much silent. Will update when I test it.
 
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