Overclock.net › Forums › Cooling › Air Cooling › Positive Pressure Setup
New Posts  All Forums:Forum Nav:

Positive Pressure Setup - Page 2

post #11 of 29
Thread Starter 
Thank you for replying.

A bottom intake fan? Never thought about putting a fan there before. But I am limited to buying three NF-A14 FLX fans. I might buy more in a couple of months.

I have thought of another setup I could use. Since my rear exhaust should have a higher RPM than my CPU cooler is exhausting, I am thinking I should use the low noise adapter on my NH-D14 and bring my NF-P14 down to about 900RPM and my NF-P12 to 900RPM/1100RPM. I will use the NF-A14 FLX fans as front intake at 1200RPM.

Does this sound like a good idea? I plan to overclock my CPU to 4.5GHz at least, so I don't think it would hurt temps too bad.

Tell me what you guys think.
post #12 of 29
Quote:
Originally Posted by jasiu View Post

Thank you for replying.

A bottom intake fan? Never thought about putting a fan there before. But I am limited to buying three NF-A14 FLX fans. I might buy more in a couple of months.

I have thought of another setup I could use. Since my rear exhaust should have a higher RPM than my CPU cooler is exhausting, I am thinking I should use the low noise adapter on my NH-D14 and bring my NF-P14 down to about 900RPM and my NF-P12 to 900RPM/1100RPM. I will use the NF-A14 FLX fans as front intake at 1200RPM.

Does this sound like a good idea? I plan to overclock my CPU to 4.5GHz at least, so I don't think it would hurt temps too bad.

Tell me what you guys think.

Use ULNA on a stock 120mm fan as an extra intake. Even on a low rpm, it will blow cooler air into the case, all the while keeping the noise to a minimum since it's on the bottom of the case.
post #13 of 29
Quote:
Originally Posted by jasiu View Post

Thank you for replying.

A bottom intake fan? Never thought about putting a fan there before. But I am limited to buying three NF-A14 FLX fans. I might buy more in a couple of months.

I have thought of another setup I could use. Since my rear exhaust should have a higher RPM than my CPU cooler is exhausting, I am thinking I should use the low noise adapter on my NH-D14 and bring my NF-P14 down to about 900RPM and my NF-P12 to 900RPM/1100RPM. I will use the NF-A14 FLX fans as front intake at 1200RPM.

Does this sound like a good idea? I plan to overclock my CPU to 4.5GHz at least, so I don't think it would hurt temps too bad.

Tell me what you guys think.
I would get PWM fans. So much easier to build a quiet system and still have extreme cooling ability. With a PWM splitter with molex power and you can control the speed 4 or 5 fans with mobo CPU fan socket PWM signal.

I use "cooler" fans for everything. Reason is they have the power to overcome any resistance to airflow through the case.. Most "case" fans can't or can only if running much higher rpm.. so noise. "Cooler" fans are built to overcome the resistance of cooler fins.. Well our cases have just as much resistance.. grills, filters, HDD cages, cables, etc. I've found I usually don't need any exhaust fans. I cut out the back exhaust vent grills, and open unused PCI slots and let the air find it's way out.
post #14 of 29
By cooler,I think he means high pressure fans.
post #15 of 29
Quote:
Originally Posted by RickyFromVegas View Post

By cooler,I think he means high pressure fans.
Give that man a cigar! biggrin.gif

Some fan makers (Noctua) class their high static pressure fans as cooler fans and their lower pressure fans as case fans. wink.gif
post #16 of 29

As I see it, much of the problem comes from case manufacturers who insist on putting grills over their exhaust windows. If you are willing to mod your case you could have that rear grill out, and then air would flow out on it's own, with no exhaust fan needed. With a rear grill, you need a fan to force the air out, with all the noise that entails.

 

Years ago and more recently people have tested the temps of cases with positive and negative pressure. The negative pressure cases are cooler; no hot spots occur. But if the rear grill is removed (or if you have an aluminum case that has no rear grill) you cannot get a pressure buildup. Call it a positive flow case.

 

If you leave your case unmodded, then try putting your fans at various places in your case, then compare temps. It's the only way you'll know. Calculation is inadequate for such complicated airflow.

alpha updated
(19 items)
 
secundus
(14 items)
 
 
CPUMotherboardGraphicsRAM
i7 4790k Gigabyte GA-Z97X Gaming-7 Intel HD4600 Crucial Ballistix Sport Very Low Profile 8GB Ki... 
Hard DriveCoolingOSMonitor
Samsung 840 EVO 500GB Prolimatech Megahalems Rev. C Windows 8.1 Home Premium 64-bit Acer K242HL 
KeyboardPowerCaseMouse
Dell SK-8110 (PS/2) Seasonic X460 Fanless motherboard tray from CM ATCS 840 Logitech MX 1100 
Mouse PadAudio
Dell Creative SoundBlaster X-Fi MB3 
CPUMotherboardGraphicsRAM
i7 860 Gigabyte GA P55M UD2 ZOTAC/NVidia GTX 650 Ti 2GB 4x4GB G.Skill Ripjaws DDR3-1333 CAS9 
Hard DriveOptical DriveCoolingOS
Samsung 1TB Spinpoint F3 7200.12 Plextor 24x DVD burner Cooler Master Hyper Z600R Win7 64-bit 
MonitorKeyboardPowerCase
Dell E207WFP 20-inch flat panel Logitech Wireless 510 Seasonic X-650 fully modular 80+ Gold Lian Li PC-7FN 
MouseMouse PadAudio
Wireless Mouse WACOM Intuos 3 generic 
  hide details  
Reply
alpha updated
(19 items)
 
secundus
(14 items)
 
 
CPUMotherboardGraphicsRAM
i7 4790k Gigabyte GA-Z97X Gaming-7 Intel HD4600 Crucial Ballistix Sport Very Low Profile 8GB Ki... 
Hard DriveCoolingOSMonitor
Samsung 840 EVO 500GB Prolimatech Megahalems Rev. C Windows 8.1 Home Premium 64-bit Acer K242HL 
KeyboardPowerCaseMouse
Dell SK-8110 (PS/2) Seasonic X460 Fanless motherboard tray from CM ATCS 840 Logitech MX 1100 
Mouse PadAudio
Dell Creative SoundBlaster X-Fi MB3 
CPUMotherboardGraphicsRAM
i7 860 Gigabyte GA P55M UD2 ZOTAC/NVidia GTX 650 Ti 2GB 4x4GB G.Skill Ripjaws DDR3-1333 CAS9 
Hard DriveOptical DriveCoolingOS
Samsung 1TB Spinpoint F3 7200.12 Plextor 24x DVD burner Cooler Master Hyper Z600R Win7 64-bit 
MonitorKeyboardPowerCase
Dell E207WFP 20-inch flat panel Logitech Wireless 510 Seasonic X-650 fully modular 80+ Gold Lian Li PC-7FN 
MouseMouse PadAudio
Wireless Mouse WACOM Intuos 3 generic 
  hide details  
Reply
post #17 of 29
Good advice there, ehume. I also have read before and that rear grill really does make a big difference.
post #18 of 29
Rear grill is there for liability purposes. With the grill present, you won't hurt yourself when you accidentally stick your fingers in there.

For ventilation purposes, grills are counter productive.
post #19 of 29
Wire "finger guards" are low resistance and keep things out of fans too.
post #20 of 29
personally, I still prefer a positive pressure build. positive pressure allows you to direct where and how much of the air flows out of the case by strategically increase or reduce airflow resistance in various parts of the case. positive flow is good. however certain areas will naturally be favored (CPU exhaust area) due to conventional case design, whereas the GPU area is often in need of more cooling due to actual wattage used during load. positive flow can be adjusted to compensate for these needs, but i believe the amount of airflow required would be greater to achieve the same result. a higher airflow usually result in higher decibel levels which is essentially what it all boils down to. keeping the same cooling capacity while reducing noise levels. otherwise, any delta or san ace can get the job done biggrin.gif
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Air Cooling
Overclock.net › Forums › Cooling › Air Cooling › Positive Pressure Setup