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positive vs negitive air pressure?

post #1 of 8
Thread Starter 
I have a question. what's best in a case? more air in and less out or more out and less in? simple question. thanks
:3
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:3
(10 items)
 
   
CPUMotherboardGraphicsRAM
2600k Asus P8Z77-I Deluxe GTX 680 2GB 16GB Corsair vengeance  
Hard DriveOSMonitorPower
2x 250GB HyperX Windows 7 SP1 x64 Benq G2420HD XFX 650W 
CaseAudio
lian li pc-q08b On-board 
CPUMotherboardGraphicsRAM
phenom II X4 955 C3 @ 4.2ghz 1.4v ASUS M4A79T Deluxe Radeon HD 5870 crossfire 940/1300 8GB corsair ddr3 1600mhz 7-8-7-20@1.75v 
Hard DriveCoolingCoolingOS
120GB Kingston HyperX SSD, 250gb HDD x3 +660Gb 5870 Accelero Xtreme Corsair H100  win 7 ultimate 64bit (stipped to bone) 
MonitorPowerCase
Benq G2420HD XFX Pro 650W (sleeved) (seasonic in disguise) Bitfenix Colossus 
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post #2 of 8
If you have fan filters or dust isn't a problem in your house, then negative pressure is the way to go, I believe.
post #3 of 8
Positive. More in, less out.

Flow is important too.
    
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CPUMotherboardGraphicsRAM
Xeon E5-1680 V2  R4BE  TITAN X (Pascal)   2666 Dominator Platinum CL10 
Hard DriveCoolingCoolingOS
750 NVMe 1.2TB EK HF/rx360/rx120 EK FC/GTs/mcp655 Windows 10 Pro  
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BL3200PT 1600 T2 800d Pro Audio 2.1 + DragonFly Red 
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post #4 of 8
Thread Starter 
I have the most dust free house ever I think, so ill go for negative then?
:3
(10 items)
 
   
CPUMotherboardGraphicsRAM
2600k Asus P8Z77-I Deluxe GTX 680 2GB 16GB Corsair vengeance  
Hard DriveOSMonitorPower
2x 250GB HyperX Windows 7 SP1 x64 Benq G2420HD XFX 650W 
CaseAudio
lian li pc-q08b On-board 
CPUMotherboardGraphicsRAM
phenom II X4 955 C3 @ 4.2ghz 1.4v ASUS M4A79T Deluxe Radeon HD 5870 crossfire 940/1300 8GB corsair ddr3 1600mhz 7-8-7-20@1.75v 
Hard DriveCoolingCoolingOS
120GB Kingston HyperX SSD, 250gb HDD x3 +660Gb 5870 Accelero Xtreme Corsair H100  win 7 ultimate 64bit (stipped to bone) 
MonitorPowerCase
Benq G2420HD XFX Pro 650W (sleeved) (seasonic in disguise) Bitfenix Colossus 
  hide details  
Reply
:3
(10 items)
 
   
CPUMotherboardGraphicsRAM
2600k Asus P8Z77-I Deluxe GTX 680 2GB 16GB Corsair vengeance  
Hard DriveOSMonitorPower
2x 250GB HyperX Windows 7 SP1 x64 Benq G2420HD XFX 650W 
CaseAudio
lian li pc-q08b On-board 
CPUMotherboardGraphicsRAM
phenom II X4 955 C3 @ 4.2ghz 1.4v ASUS M4A79T Deluxe Radeon HD 5870 crossfire 940/1300 8GB corsair ddr3 1600mhz 7-8-7-20@1.75v 
Hard DriveCoolingCoolingOS
120GB Kingston HyperX SSD, 250gb HDD x3 +660Gb 5870 Accelero Xtreme Corsair H100  win 7 ultimate 64bit (stipped to bone) 
MonitorPowerCase
Benq G2420HD XFX Pro 650W (sleeved) (seasonic in disguise) Bitfenix Colossus 
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Reply
post #5 of 8
Keep in mind that your graphics card cooler pushes air out through the pci bracket. What happens if you suck that air back?
post #6 of 8
Unless you have all the gaps in your case sealed (device bays, side panel, etc) positive is the way to go. (as dust free as you think your house is, dust will still find its way in to your case)
post #7 of 8
more air in is better. in my experience fans are more effective when pushing air in as oppose pulling it out of a case.

for negative pressure to have any good effects the fans have to be really close to or in contact to what ever they're trying to cool (ie rads)
post #8 of 8
Slightly positive, not talking 8:1 ratio with just a rear exhaust
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