Overclock.net › Forums › Case Mods & Cases › Computer Cases › Positive or negative pressure... help me please!
New Posts  All Forums:Forum Nav:

Positive or negative pressure... help me please!

post #1 of 6
Thread Starter 
So, I just bought a NZXT Phantom case last week and I am trying to figure out the best cooling solution. I want to try and keep dust out of my system as much as possible so I believe positive pressure is the way to go. I would really like some input from fellow Phantom members or anyone that knows what works the best for them. My Sig Rig is current and I am also thinking of buying some new higher CFM fans to help with better cooling but my cpu under load @ 4.0ghz hits 43c biggrin.gif

Current cooling setup. The yellow arrows are side INTAKE fans 200mm and two 120mm.
450

I was thinking about going with this for all positive pressure and again yellow arrows are side intakes.
450

Any suggestions would be helpful on what setup would be best for cooling and limiting or lowering dust amounts inside my case... Thank you
White Knight
(0 items)
  
Reply
White Knight
(0 items)
  
Reply
post #2 of 6
setup 2... from my experience and a bunch of other's ideas, Positive pressure seems to be the way to go... BUT your computer is going to be diff than any one else. So you have to experiment and see what works best for you... It will take some time but it will be worth it in the end. Check your temps after some testing. switch some fans. repeat. compare your temps and find out what is best for your machine GL thumb.gif
Blue SB Dragon
(17 items)
 
  
CPUMotherboardGraphicsGraphics
Intel Core i7 2600K ASRock Z68 Extreme4 Gen3 EVGA GTX 460 EVGA 9800GT 
GraphicsRAMOptical DriveCooling
EVGA 9800GT Corsair  LITE-ON 20X DVD±R DVD Burner with LightScr Custom water cooling 
OSMonitorKeyboardPower
Windows 7 Professional 64bit Acer AL2002W Logitech G15 v1 PC-P&C 750 Quad 
CaseMouseMouse PadAudio
HAF 932 Logitech G5 (1st edition) Rocketfish 17" Logitech x-530 5.1 
Audio
Logitech G35 Headset 
  hide details  
Reply
Blue SB Dragon
(17 items)
 
  
CPUMotherboardGraphicsGraphics
Intel Core i7 2600K ASRock Z68 Extreme4 Gen3 EVGA GTX 460 EVGA 9800GT 
GraphicsRAMOptical DriveCooling
EVGA 9800GT Corsair  LITE-ON 20X DVD±R DVD Burner with LightScr Custom water cooling 
OSMonitorKeyboardPower
Windows 7 Professional 64bit Acer AL2002W Logitech G15 v1 PC-P&C 750 Quad 
CaseMouseMouse PadAudio
HAF 932 Logitech G5 (1st edition) Rocketfish 17" Logitech x-530 5.1 
Audio
Logitech G35 Headset 
  hide details  
Reply
post #3 of 6
top front fan = intake.
top rear fan slot blocked off to reduce recirculation of hot exhaust.
post #4 of 6

I have a few comments:-

1) Dusts inside a case mostly come through intake fans and only a small portion comes from crevices.  So, having a positive pressure case is only a second order preventive measure.  Make sure all intake fans have dust filter.  For example, the rear top fan does not come with a stock dust filter.  If you change it from exhaust to intake, a dust filter is needed.

 

2) Looking at your 2nd pic, I notice the end result is a hugely pressure positive environment.  Basically the PSU takes care of itself.  So, the exhausts are just the case rear 140mm fan and the graphics card.  Their combined exhaust is like 63+10=73 CFM.  However, the combined intake is like 90+90+90+63+47+47=427 CFM.  The differential is huge.  See pic below:-

nzxt intake and exhaust cfm analysis.JPG

 

3) Such a huge differential might lead to some problem, especially the exhausts are so little.

For example, the GTX560Ti OC2 is a bi-directional exhausting card.  Half of its exhaust is from its front (see the red arrow in the pic below).  This amount of hot exhaust should get out of the case as quickly as possible.  Since the only exhaust is through the case rear 120mm fan, this exhaust should go there.  However, there is big air pressure coming down from the case's two top intake 200mm fans.  As a result, it is possible this exhaust from the graphics card will stay longer inside the case than it needs to be.  Obviously this is not desirable.

nzxt phantom with pny 560ti oc2.JPG

 

4) You need to do some trial-and-error to see which combination of intake fans make the best.

As a start, I suggest:-

(a) top front fan - intake

(b) top rear fan - no use

(c) side panel's two 120mm fans - no use

 

post #5 of 6
Thread Starter 
Ok guys spent 30mins on prime95 for each setup and found that my original setup gave the best cooling... only by 3c which could be a margin of error.

Yellow is side intake fans.

450
White Knight
(0 items)
  
Reply
White Knight
(0 items)
  
Reply
post #6 of 6
Go with your 1st set-up,but-
Install a high power fan in the rear exhaust
flip your PSU to extract dead air under GPU
Amelia
(13 items)
 
Professional
(13 items)
 
RCPC#1
(17 items)
 
CPUMotherboardGraphicsRAM
Phenom II X6 1100t MSI 890FX GD65 MSI Radeon HD5670 GSkill RipjawsX DDR3 PC3 12800 2x4GB CL8 
Hard DriveOptical DriveCoolingOS
WD Black 1TB SATA III Samsung BD Zalman 9900MAX Windows 7 64 Professional 
MonitorKeyboardPowerCase
AOC 22" LED Logitech Kingwin Lazer Platinum 500w Fractal Design R3 
Other
Samsung 470 SSD 128GB 
CPUMotherboardGraphicsRAM
AMD Phenom II X6 960T Asus M4A88T-VEVO Asus Strix R7 370 SuperTalent Perfomance 
RAMHard DriveHard DriveOptical Drive
GSkill Snipers Monster Daytona Seagate Barracuda 500GB 7,200 RPM 16Mb cache Memorex DVD/RW 
CoolingOSMonitorKeyboard
Corsair H60 Windows 8N IBM 9494 19" LCD IBM 
PowerCaseMouseMouse Pad
Corsair GS500 In Win H-Frame Wolfking OCZ Behemoth 
Audio
JBL Creature 
  hide details  
Reply
Amelia
(13 items)
 
Professional
(13 items)
 
RCPC#1
(17 items)
 
CPUMotherboardGraphicsRAM
Phenom II X6 1100t MSI 890FX GD65 MSI Radeon HD5670 GSkill RipjawsX DDR3 PC3 12800 2x4GB CL8 
Hard DriveOptical DriveCoolingOS
WD Black 1TB SATA III Samsung BD Zalman 9900MAX Windows 7 64 Professional 
MonitorKeyboardPowerCase
AOC 22" LED Logitech Kingwin Lazer Platinum 500w Fractal Design R3 
Other
Samsung 470 SSD 128GB 
CPUMotherboardGraphicsRAM
AMD Phenom II X6 960T Asus M4A88T-VEVO Asus Strix R7 370 SuperTalent Perfomance 
RAMHard DriveHard DriveOptical Drive
GSkill Snipers Monster Daytona Seagate Barracuda 500GB 7,200 RPM 16Mb cache Memorex DVD/RW 
CoolingOSMonitorKeyboard
Corsair H60 Windows 8N IBM 9494 19" LCD IBM 
PowerCaseMouseMouse Pad
Corsair GS500 In Win H-Frame Wolfking OCZ Behemoth 
Audio
JBL Creature 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Computer Cases
Overclock.net › Forums › Case Mods & Cases › Computer Cases › Positive or negative pressure... help me please!