Overclock.net › Forums › Cooling › Air Cooling › CFM vs static pressure for case fans - which ones?
New Posts  All Forums:Forum Nav:

CFM vs static pressure for case fans - which ones?

post #1 of 9
Thread Starter 
I'm having trouble deciding which is a good case fan, not for a radiator or heatsink and weather CFM or static pressure matters more?

I want quiet as well.

My case can only accept 2 120mm and 2 140mm, unless the 120mm fans come with some adapter?

How are the Noctua 140mm fans?
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 930 Asus P6X58D-E Powercolor 5870 Reference G.Skill RIPJAW 3x2gb DDR3 1600 
Hard DriveOptical DriveOSMonitor
Seagate 500GB LG Blu-Ray burner 7 - 64bit Asus 27" 
PowerCase
Corsair HX850 Corsair 800D 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 930 Asus P6X58D-E Powercolor 5870 Reference G.Skill RIPJAW 3x2gb DDR3 1600 
Hard DriveOptical DriveOSMonitor
Seagate 500GB LG Blu-Ray burner 7 - 64bit Asus 27" 
PowerCase
Corsair HX850 Corsair 800D 
  hide details  
Reply
post #2 of 9
static pressure won't matter.
post #3 of 9
The Noctua 140mm is good, I have one, hell all the Noctua fans in my case are quiet.
Revofev
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 950 EVGA E770 2x EVGA GTX 570 6GB Mushkin Redline Ridgeback 
Hard DriveOptical DriveOSMonitor
128GB Crucial M4/ 4x1TB WD Black/ 1TB F3 Lite-On 24x Win 7 Ultimate x64 Acer H233H 
KeyboardPowerCaseMouse
Filco Majestouch 2 w/ Red Switches Corsair AX850 800D Logitech G500 
Mouse Pad
Steelseries QcK+ 
  hide details  
Reply
Revofev
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 950 EVGA E770 2x EVGA GTX 570 6GB Mushkin Redline Ridgeback 
Hard DriveOptical DriveOSMonitor
128GB Crucial M4/ 4x1TB WD Black/ 1TB F3 Lite-On 24x Win 7 Ultimate x64 Acer H233H 
KeyboardPowerCaseMouse
Filco Majestouch 2 w/ Red Switches Corsair AX850 800D Logitech G500 
Mouse Pad
Steelseries QcK+ 
  hide details  
Reply
post #4 of 9
IIRC static pressure is good for high fin density heatsinks/radiators.
The 775 Legend
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8600 @ 5.8 -- 1.736v Rampage Formula! GTX550ti Vmod! OCZ D9's @ 1200+ cas 5 
OSMonitorPowerCase
XPEEEEEEEEEEEEEEEEEEEEEEE XGA 800x600 TR2-RX 850W Neoprene sheet 
  hide details  
Reply
The 775 Legend
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8600 @ 5.8 -- 1.736v Rampage Formula! GTX550ti Vmod! OCZ D9's @ 1200+ cas 5 
OSMonitorPowerCase
XPEEEEEEEEEEEEEEEEEEEEEEE XGA 800x600 TR2-RX 850W Neoprene sheet 
  hide details  
Reply
post #5 of 9
You are looking for purely CFM ratings, assuming you have no restriction on the flow, no need for high pressure to overcome the flow!
For sale
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7-920 Asus P6T Deluxe Asus GTX460 TOP 768mb G Skill ECO 1600 CAS7 1.35V 
Hard DriveOptical DriveOSMonitor
2x Vertex 60 GB raid[0] Asus DVDRW W7,Ubuntu 2 xAsus VH236H 
KeyboardPowerCaseMouse Pad
Razer Ultra X3 1000W HAF 932 My Desk 
  hide details  
Reply
For sale
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7-920 Asus P6T Deluxe Asus GTX460 TOP 768mb G Skill ECO 1600 CAS7 1.35V 
Hard DriveOptical DriveOSMonitor
2x Vertex 60 GB raid[0] Asus DVDRW W7,Ubuntu 2 xAsus VH236H 
KeyboardPowerCaseMouse Pad
Razer Ultra X3 1000W HAF 932 My Desk 
  hide details  
Reply
post #6 of 9
Thread Starter 
Awesome, so basically, now the problem is with how 140mm fans aren't popular hence the manufactuerer's don't focus on them...

http://www.ncix.com/products/index.p...facture=Noctua

Looks like it mounts for a 120mm and has an adapter.. Maybe I'm better off to buy the adapters for the 140mm spacing?

I'm looking at the S-Flex E or F fans @ 120mm or either the Noctua ones, not sure which are good though.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 930 Asus P6X58D-E Powercolor 5870 Reference G.Skill RIPJAW 3x2gb DDR3 1600 
Hard DriveOptical DriveOSMonitor
Seagate 500GB LG Blu-Ray burner 7 - 64bit Asus 27" 
PowerCase
Corsair HX850 Corsair 800D 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 930 Asus P6X58D-E Powercolor 5870 Reference G.Skill RIPJAW 3x2gb DDR3 1600 
Hard DriveOptical DriveOSMonitor
Seagate 500GB LG Blu-Ray burner 7 - 64bit Asus 27" 
PowerCase
Corsair HX850 Corsair 800D 
  hide details  
Reply
post #7 of 9

The Scythe Kaze Maru 2 is a 140mm fan that fits 120mm mounts. http://www.frozencpu.com/products/10...?tl=g36c15s775

The Noctua NF-P14 FLX is a 140mm fan that can fit in either 120mm or 140mm mounts. http://www.frozencpu.com/products/99...?tl=g36c15s775

Static pressure is important for directional airflow. Fans with low static pressure just move air from one side of the frame to the other. The higher the static pressure, the more direct and "funneled" the airflow will be. Here is an example -


Edited by spaceballsrules - 9/12/10 at 9:08pm
Short Stuff
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II 945 Asus M5A97 EVO Asus HD 6570 2x4GB G.SKILL DDR3 1866 
Hard DriveOptical DriveOSMonitor
not SSD Samsung SH-203B Vista. YEAH, Vista! Samsung 32" LCD HDTV 720p 
KeyboardPowerCaseMouse
Logitech wireless Seasonic X560 CM 690 II Logitech wireless 
Mouse Pad
Staples 
  hide details  
Reply
Short Stuff
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II 945 Asus M5A97 EVO Asus HD 6570 2x4GB G.SKILL DDR3 1866 
Hard DriveOptical DriveOSMonitor
not SSD Samsung SH-203B Vista. YEAH, Vista! Samsung 32" LCD HDTV 720p 
KeyboardPowerCaseMouse
Logitech wireless Seasonic X560 CM 690 II Logitech wireless 
Mouse Pad
Staples 
  hide details  
Reply
post #8 of 9
For a case fan, CFM is what you should be looking at, though those AP-181's are a prime example of why it's not the only thing.
The Fortress
(15 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 930 @ 4.0 GHz 1.28V Gigabyte X58A-UD3R Sapphire Radeon HD 5850 1GB 850MHz Core, 4800MH... Kingston 6GB 1528MHz 7-7-7-20-1T 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 1TB LG WH10LS30 10X Blu-ray Burner CoolerMaster Hyper 212+ Windows 7 Ultimate 64-bit 
MonitorKeyboardPowerCase
Acer X233Hbd 23" 1080p Logitech Illuminated Keyboard BFG GS-650 Silverstone FT01 
MouseMouse PadAudio
Razer Naga Molten Edition Cloth Pad Philips 2.1 
  hide details  
Reply
The Fortress
(15 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 930 @ 4.0 GHz 1.28V Gigabyte X58A-UD3R Sapphire Radeon HD 5850 1GB 850MHz Core, 4800MH... Kingston 6GB 1528MHz 7-7-7-20-1T 
Hard DriveOptical DriveCoolingOS
WD Caviar Black 1TB LG WH10LS30 10X Blu-ray Burner CoolerMaster Hyper 212+ Windows 7 Ultimate 64-bit 
MonitorKeyboardPowerCase
Acer X233Hbd 23" 1080p Logitech Illuminated Keyboard BFG GS-650 Silverstone FT01 
MouseMouse PadAudio
Razer Naga Molten Edition Cloth Pad Philips 2.1 
  hide details  
Reply
post #9 of 9
yeah...as far as 140's go, there are quite a few good ones out there for case fan use. Not so much for radiator/heatsink use though.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Air Cooling
Overclock.net › Forums › Cooling › Air Cooling › CFM vs static pressure for case fans - which ones?