Overclock.net › Forums › Industry News › Hardware News › [ROG] Positive vs Negative Pressure
New Posts  All Forums:Forum Nav:

[ROG] Positive vs Negative Pressure

post #1 of 44
Thread Starter 
Quote:
Final Conclusion:

So which set up is the best? Directed intake airflow is always the best over hot components and the more fans you can add the better. Obviously there’s a cost of noise to this benefit, but by using features like Fan Xpert or Thermal Radar it can be balanced by slowing down the fans.

Positive pressure is overwhelmingly a benefit, not only for the reasons listed above but also because it pushes dust out of the case and, if your case is well designed, catches most of it on the fan filters before it can get in.

I thought this would be a nice article to post. He did some hands on work and knew the ambient temps.

Source
Pearl Tank
(18 items)
 
  
CPUMotherboardGraphicsRAM
i5 3570K MSI Z77 MPOWER Gigabyte GTX 780 GHZ EDITION 16GB 2133mhz Kingston HyperX Beast 
Hard DriveHard DriveHard DriveOptical Drive
Samsung EVO Samsung EVO WD Velociraptor 600gb Pioneer 12x BDR-2207 
CoolingOSMonitorKeyboard
Prolimatech Armageddon Windows 7 Home Premium BenQ XL2420T Max Keyboard Nighthawk x9 
PowerCaseMouseMouse Pad
SeaSonic X-1250 Caselabs M8 Logitech G700s Steelseries Quick 
AudioAudio
Creative Sound Blaster ZXR HD558 
  hide details  
Reply
Pearl Tank
(18 items)
 
  
CPUMotherboardGraphicsRAM
i5 3570K MSI Z77 MPOWER Gigabyte GTX 780 GHZ EDITION 16GB 2133mhz Kingston HyperX Beast 
Hard DriveHard DriveHard DriveOptical Drive
Samsung EVO Samsung EVO WD Velociraptor 600gb Pioneer 12x BDR-2207 
CoolingOSMonitorKeyboard
Prolimatech Armageddon Windows 7 Home Premium BenQ XL2420T Max Keyboard Nighthawk x9 
PowerCaseMouseMouse Pad
SeaSonic X-1250 Caselabs M8 Logitech G700s Steelseries Quick 
AudioAudio
Creative Sound Blaster ZXR HD558 
  hide details  
Reply
post #2 of 44
Quote:
Originally Posted by i7Stealth1366 View Post

Quote:
Final Conclusion:
So which set up is the best? Directed intake airflow is always the best over hot components and the more fans you can add the better. Obviously there’s a cost of noise to this benefit, but by using features like Fan Xpert or Thermal Radar it can be balanced by slowing down the fans.
Positive pressure is overwhelmingly a benefit, not only for the reasons listed above but also because it pushes dust out of the case and, if your case is well designed, catches most of it on the fan filters before it can get in.
I thought this would be a nice article to post. He did some hands on work and knew the ambient temps.
Source

I would say i have pos pressure. Wish i could detach my top 200mm fan to swap it for intake!
BMO
(21 items)
 
  
CPUMotherboardGraphicsRAM
Intel 3930K 4.5GHz HT GIGABYTE GA-X79-UP4 GIGABYTE R9 290X (x2) *CFX* GEil Evo Potenza DDR3 2666MHz (4x4GB) 
Hard DriveCoolingCoolingCooling
Samsung 840 Pro 128GB EK Supremacy Copper/Acetal  EK-FC R9 290X Copper/Plexi  EK-FC R9 290X Copper/Plexi  
CoolingCoolingCoolingCooling
EK D5 Vario Top-X  Phobya G-Changer V2 360 Copper RAD  Phobya G-Changer V2 420 Copper RAD  NF F12's P/P (On 360 Rad)  
CoolingOSMonitorKeyboard
NF A14's (On 420 Rad)  Win-8.1 Pro 64-Bit ASUS VG278HE 27" 144Hz  Corsair Vengeance K90 
PowerCaseMouseAudio
Seasonic X-860 Platinum Xigmatek Elysium  Logitech G400s CM Pulse R + Mic 
Audio
Creative Sound Blaster Z 
  hide details  
Reply
BMO
(21 items)
 
  
CPUMotherboardGraphicsRAM
Intel 3930K 4.5GHz HT GIGABYTE GA-X79-UP4 GIGABYTE R9 290X (x2) *CFX* GEil Evo Potenza DDR3 2666MHz (4x4GB) 
Hard DriveCoolingCoolingCooling
Samsung 840 Pro 128GB EK Supremacy Copper/Acetal  EK-FC R9 290X Copper/Plexi  EK-FC R9 290X Copper/Plexi  
CoolingCoolingCoolingCooling
EK D5 Vario Top-X  Phobya G-Changer V2 360 Copper RAD  Phobya G-Changer V2 420 Copper RAD  NF F12's P/P (On 360 Rad)  
CoolingOSMonitorKeyboard
NF A14's (On 420 Rad)  Win-8.1 Pro 64-Bit ASUS VG278HE 27" 144Hz  Corsair Vengeance K90 
PowerCaseMouseAudio
Seasonic X-860 Platinum Xigmatek Elysium  Logitech G400s CM Pulse R + Mic 
Audio
Creative Sound Blaster Z 
  hide details  
Reply
post #3 of 44
I wonder what the results would be if the GPU cooler was like a MSI Twin Frozr or Asus DirectCU instead of the blower fan.
Stardust Speedway
(16 items)
 
  
CPUMotherboardGraphicsRAM
Core i5 2500k Asus P8Z68-V Pro MSI HD 6970 16 GB Samsung DDR3 1600 MHz 
Hard DriveHard DriveHard DriveHard Drive
Crucial M4 128 GB Samsung 830 256 GB Hitachi Deskstar 5K3000 2 TB Western Digital Black 1 TB 
CoolingOSKeyboardPower
Noctua NH-D14 SE2011 Windows 7 Professional 64-bit CM Storm QF Rapid Cherry Blue Antec TruePower New 750 W 
CaseMouseMouse PadAudio
Silverstone TJ09-B Steelseries Sensei Puretrak Talent Asus Xonar DX 
  hide details  
Reply
Stardust Speedway
(16 items)
 
  
CPUMotherboardGraphicsRAM
Core i5 2500k Asus P8Z68-V Pro MSI HD 6970 16 GB Samsung DDR3 1600 MHz 
Hard DriveHard DriveHard DriveHard Drive
Crucial M4 128 GB Samsung 830 256 GB Hitachi Deskstar 5K3000 2 TB Western Digital Black 1 TB 
CoolingOSKeyboardPower
Noctua NH-D14 SE2011 Windows 7 Professional 64-bit CM Storm QF Rapid Cherry Blue Antec TruePower New 750 W 
CaseMouseMouse PadAudio
Silverstone TJ09-B Steelseries Sensei Puretrak Talent Asus Xonar DX 
  hide details  
Reply
post #4 of 44
Quote:
Originally Posted by BradleyW View Post

I would say i have pos pressure. Wish i could detach my top 200mm fan to swap it for intake!

Why can't you swap it? It is very simple to do on your Haf-X. There are four tabs in each corner that you push on and the entire top panel comes off. On mine I don't even need to touch the release tabs I use a knife at each point on the case that has a tab. Slide the knife in and twist and it pops the top panel right off.thumb.gif
Remedy
(16 items)
 
  
CPUMotherboardGraphicsGraphics
3930k Rampage IV Extreme EVGA GTX 680 EVGA GTX 680 
RAMHard DriveOptical DriveCooling
Corsair Dominator GT 2133 Samsung 830 SSD LG Blueray Water 
OSMonitorKeyboardPower
Windows 7 Yamakasi Filco  Seasonic 
CaseMouseMouse PadAudio
CaseLabs STH10 Logitech G9x Steelseries Logitech z5500 
  hide details  
Reply
Remedy
(16 items)
 
  
CPUMotherboardGraphicsGraphics
3930k Rampage IV Extreme EVGA GTX 680 EVGA GTX 680 
RAMHard DriveOptical DriveCooling
Corsair Dominator GT 2133 Samsung 830 SSD LG Blueray Water 
OSMonitorKeyboardPower
Windows 7 Yamakasi Filco  Seasonic 
CaseMouseMouse PadAudio
CaseLabs STH10 Logitech G9x Steelseries Logitech z5500 
  hide details  
Reply
post #5 of 44
Fail article
I don't agree with using the H50 as the only exhaust for the negative pressure tests. Blowing through a radiator will significantly reduce the airflow. It seems to me from my experience you need a high flow rear exhaust to properly optimize a negative pressure set-up.
He even states in the beginning this is for you "air-cooled" fanboys, and what's best for an air-cooled set-up. Then proceeds to test his theories with a watercooler. doh.gif
RCPC#1
(17 items)
 
Professional
(13 items)
 
 
CPUMotherboardGraphicsRAM
AMD Phenom II X6 960T Asus M4A88T-VEVO GTX 650 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 
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 
  hide details  
Reply
RCPC#1
(17 items)
 
Professional
(13 items)
 
 
CPUMotherboardGraphicsRAM
AMD Phenom II X6 960T Asus M4A88T-VEVO GTX 650 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 
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 
  hide details  
Reply
post #6 of 44
Negative works just as well if you have a super powerful rear fan such as a Delta.
Main System
(16 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 560 @ 4.00Ghz Asus EVO USB3.0 GTX 670 8 GB 1600 Corsair 
Hard DriveOptical DriveCoolingOS
Samsung 830 128GB, 80GB Raptor, 1 TB 7200 RPM, ... LG Zalman CNPS 9700 Windows 7 Home Premium 64Bit 
MonitorMonitorKeyboardPower
Dell U2311H 23" HP ZR30w Razer Black Widow Ultimate Edition Corsair TX650w 
CaseMouseMouse PadAudio
Corsair 600T Special Edition (White) Razer Imperator 4G Absent Asus Xonar DS, Sony STR-DH720 Reciever , Sennhi... 
  hide details  
Reply
Main System
(16 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 560 @ 4.00Ghz Asus EVO USB3.0 GTX 670 8 GB 1600 Corsair 
Hard DriveOptical DriveCoolingOS
Samsung 830 128GB, 80GB Raptor, 1 TB 7200 RPM, ... LG Zalman CNPS 9700 Windows 7 Home Premium 64Bit 
MonitorMonitorKeyboardPower
Dell U2311H 23" HP ZR30w Razer Black Widow Ultimate Edition Corsair TX650w 
CaseMouseMouse PadAudio
Corsair 600T Special Edition (White) Razer Imperator 4G Absent Asus Xonar DS, Sony STR-DH720 Reciever , Sennhi... 
  hide details  
Reply
post #7 of 44
I'm a big believer in Positive pressure. I have open PCI slot covers and my only exaust is my Antec Kuhler 920/7970 blower. Three intake in front,(one in 5.25 bay) two intake on top, one on the side and I get super low temps. My OC'd 7970 barely breaks 70 degrees and my CPU under load stays under 50 (that is partially a function of me only clocking it to 4.0ghz but still very cool).

I believe fans function primarily to simply feed my 7970 blower and 920. The way m PC is setup air simply blasts from front to back with two low powered fans on top to push even more fresh air into the 920.
OP MicroATX build
(16 items)
 
  
CPUMotherboardGraphicsRAM
4770k @ 4.5ghz Asrock Z87m Extreme 4 EVGA GTX 780 TI Classy G Skill 16gb 2133 
Hard DriveHard DriveHard DriveOptical Drive
Crucial M4 Raid 0 Crucial M4 Raid 0 WD Data Drive LG Blu-Ray 
CoolingOSKeyboardPower
H100i P/P Ducky Shine 3 TKL  Seasonic X series 750 gold 
CaseMouseAudio
CM N200 Deathadder 2013 Sound Blaster Z - HD 518 
  hide details  
Reply
OP MicroATX build
(16 items)
 
  
CPUMotherboardGraphicsRAM
4770k @ 4.5ghz Asrock Z87m Extreme 4 EVGA GTX 780 TI Classy G Skill 16gb 2133 
Hard DriveHard DriveHard DriveOptical Drive
Crucial M4 Raid 0 Crucial M4 Raid 0 WD Data Drive LG Blu-Ray 
CoolingOSKeyboardPower
H100i P/P Ducky Shine 3 TKL  Seasonic X series 750 gold 
CaseMouseAudio
CM N200 Deathadder 2013 Sound Blaster Z - HD 518 
  hide details  
Reply
post #8 of 44
I nerd-rage every time I hear or see the phrase "negative pressure." I know what they are implying, but I also feel like if you're going to make a scientific-method assessment dealing with pressures, you really should be accustomed to discussing them as gradients or differentials. There is no such thing as "negative pressure" as a physical quantity. Sorry for my nerd-rage.

The one thing that always disappoints me with temperature studies is that no one ever states the ambient temperature(s) at the time of measurements. I can say that there's a good 3-8C temperature differential at my work offices depending on where the AC cycle is at. It really lends a lot of uncertainty/error to temperature reporting across a series of hours or days during testing.
    
CPUMotherboardGraphicsRAM
i5-2500K Biostar TP67B+ XFX HD5750 1GB 2x4GB DDR3 Corsair 1600 
Hard DriveOSMonitorPower
60GB OCZ SSD, 2x160GB HDD RAID0, 500GB+500GB+1.5TB Windows 7 Ultimate 64-bit Samsung SyncMaster 930B Antec SmartPower 450w 
Case
Antec 900 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i5-2500K Biostar TP67B+ XFX HD5750 1GB 2x4GB DDR3 Corsair 1600 
Hard DriveOSMonitorPower
60GB OCZ SSD, 2x160GB HDD RAID0, 500GB+500GB+1.5TB Windows 7 Ultimate 64-bit Samsung SyncMaster 930B Antec SmartPower 450w 
Case
Antec 900 
  hide details  
Reply
post #9 of 44
Good read. Maybe this would be a good time for me to ask. I have 3 front 120mm intakes plus two more on the side of the case on the other side of the hard drive bays. I have two exhausts on the top of the case and a rear exhaust. two fans on my phanteks cooler point toward my rear exhaust.

Now my question pertains to the two fans on the top of my case. If I were to turn on into an intake, does it matter which one it is due to position? (as in is it better to have the fan towards the rear of the case as intake or the one towards the front of the case?)
Heck, what are the opinions of turning both these fans into intake?

I figure it wouldn't hurt to turn one of these as I would still have a couple exhaust. Basically as it is right now I have 3 intake and 3 exhaust. I have no fans on the bottom of my case to push air upward if I turn my top fans into intake. I am not counting the two fans inside the case on the other side of the hard drive bays.
post #10 of 44
Quote:
Originally Posted by rdasch3 View Post

Good read. Maybe this would be a good time for me to ask. I have 3 front 120mm intakes plus two more on the side of the case on the other side of the hard drive bays. I have two exhausts on the top of the case and a rear exhaust. two fans on my phanteks cooler point toward my rear exhaust.
Now my question pertains to the two fans on the top of my case. If I were to turn on into an intake, does it matter which one it is due to position? (as in is it better to have the fan towards the rear of the case as intake or the one towards the front of the case?)
Heck, what are the opinions of turning both these fans into intake?
I figure it wouldn't hurt to turn one of these as I would still have a couple exhaust. Basically as it is right now I have 3 intake and 3 exhaust. I have no fans on the bottom of my case to push air upward if I turn my top fans into intake. I am not counting the two fans inside the case on the other side of the hard drive bays.

I have a similar setup to yours. I have 2 120mm front fans as intakes, 2 120mm sides as intakes, and 2 120mm tops as intakes. My H50 (push/pull) act as an exhaust, as does my PSU. This setup lowered my MOSFET and radiator temps significantly over my previous setup - where I had the H50 as an intake and the 2 top fans as exhausts.

Give it a shot, I can almost guarantee that it will lower your MOSFET/H70 temps.
Bill Cosby
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II X4 955 BE @ 4.0GHz/1.5v ASUS M4A88T-V EVO EVGA GTX 460 SE 1GB 940/1880/2050 8GB Corsair DDR3 1333MHz 
Hard DriveOSMonitorPower
WD 160GB 7200 RPM Windows 7 x64 ACER AL2016W OCZ StealthXtreme 700W 
CaseMouse
Rosewill Destroyer Logitech 
  hide details  
Reply
Bill Cosby
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II X4 955 BE @ 4.0GHz/1.5v ASUS M4A88T-V EVO EVGA GTX 460 SE 1GB 940/1880/2050 8GB Corsair DDR3 1333MHz 
Hard DriveOSMonitorPower
WD 160GB 7200 RPM Windows 7 x64 ACER AL2016W OCZ StealthXtreme 700W 
CaseMouse
Rosewill Destroyer Logitech 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Hardware News
Overclock.net › Forums › Industry News › Hardware News › [ROG] Positive vs Negative Pressure