Internal Air Pressure

Hitbox · 08-04-08, 08:29 AM

Which do you think is better?

Having a Positive internal air pressure (more air in).
-or-
Having a Negative internal air pressure (more air out).

I bought a Rocketfish and I want to avoid dead-spots.

CGR · 08-04-08, 09:43 AM

Well, I like to keep as much dust/cat hair out of my machine as possible, so I try to maintain a slight positive pressure.

If you are not worried about either, then negative pressure is ok

Adragontattoo · 08-04-08, 10:46 AM

positive, my brain doesnt seem to work well in negative terms aka, I couldnt get the Stacker to cool well enough to my tastes without loading it down with High CFM fans.

VinnyTAMU · 08-04-08, 11:42 AM

Quote:

Originally Posted by CGR

Well, I like to keep as much dust/cat hair out of my machine as possible, so I try to maintain a slight positive pressure.

If you are not worried about either, then negative pressure is ok

I agree, I do not know the scientific answer as to why positive pressure in a computer case causes lower dust accumulation, but from my experience it does.

ihrsetrdr · 08-04-08, 11:48 AM

Dust accumulation is inevitable, when running fans. The primary function of fans is for cololing, so a slightly negative pressure would be better.

Brandontw · 08-04-08, 12:07 PM

I think the official opinion is that low pressure in the case is better for cooling, as there is always air flowing through rather than stagnant air sitting in the case.

The dust thing is interesting though, i never thought about that.

Hitbox · 08-04-08, 01:48 PM

Regardless of dust. I'm obsessed enough about it to clean it out every couple of weeks.
I'm mainly concerned about dead-spots in my case gathering pockets of heat.

So it's better to have 3 fans pulling out and one pulling in?

netmask · 08-04-08, 03:22 PM

IMO it's better to have 3 fans pulling out and 1 pulling in so it creates negative pressure forcing air to move in to cover the empty space of the air that's moving out than sucking it inside along with dust.

Brandontw · 08-04-08, 04:22 PM

Quote:

Originally Posted by Hitbox

Regardless of dust. I'm obsessed enough about it to clean it out every couple of weeks.
I'm mainly concerned about dead-spots in my case gathering pockets of heat.

So it's better to have 3 fans pulling out and one pulling in?

Yeah, i'd say thats better.

SeraphNox · 08-05-08, 12:37 AM

If I remember correctly, you'd want negative air pressure for a couple of reasons. For starters, less air means less humidity, although I don't think that plays a drastic role in this case but I guess it plays a role nonetheless. Also, air itself is an insulator; negative air pressure ensures that the heat can radiate more freely and in effect be pulled from the system much quicker. This in part is also due to the fact that when you create a negative pressure environment, you not only lower the amount of air in the case but the amount of energy. Finally, when air does enter to try and balance the pressure differences, it will expand which in turn lowers the air intake's temperature.

I wrote this up at 1 in the morning so if anything seems amiss or just flat out wrong, just call me on it and I'll be sure to correct myself lol.

Diddyu · 08-05-08, 07:33 AM

Actually, the temp drop from the lower pressure will be insignificant (unless youre running a vaccum chamber) However, airflow is more turbulent when it is blown in instead of sucked in through rivets and seams, and more parts get cooled off, though YMMV.

Hitbox · 08-05-08, 07:41 AM

------------------------------------------------------------------
Okay people, thanks for the advice. Negative it is!
------------------------------------------------------------------

Diddyu · 08-05-08, 07:55 AM

Quote:

Originally Posted by Hitbox

------------------------------------------------------------------
Okay people, thanks for the advice. Negative it is!
------------------------------------------------------------------

Actually, Id try both, and see what gets you the best results.

nightelph · 08-05-08, 08:10 AM

Quote:

Originally Posted by Diddyu

Actually, Id try both, and see what gets you the best results.

Best advice yet, imo.

WarriorII · 08-05-08, 12:30 PM

Quote:

Originally Posted by Diddyu

Actually, Id try both, and see what gets you the best results.

I've tried both ways & ended up going H2O.

What ever works best for your situation. YMMV.

Micmal · 08-05-08, 01:05 PM

I have all intakes (4) with the rad blowing out(3). This is good for two things:

Dust: The intakes are all filtered, so there should be no dust in the case, as any small gaps in the case will blow air out which will prevent unfiltered air from entering the case.

More pressure on rad: I'm not sure if this has any effect, but from a logical stand point it does. Basically due to the case's internal pressure, air will naturally try to be pushed through the rad. the added pressure might help in clearing air through the rad. This gets me thinking, because I might actually be able to turn off the rad fans just because I have a positive case pressure as air will flow through it due to the pressure.

08-04-08, 08:29 AM	Thread Starter #1
Hitbox Member Join Date: Jun 2008 Location: Winter Park, FL	Internal Air Pressure Which do you think is better? Having a Positive internal air pressure (more air in). -or- Having a Negative internal air pressure (more air out). I bought a Rocketfish and I want to avoid dead-spots. __________________ Windows 7 64-bit EVGA 750i FTW.......Silverstone KL02B-W E8400 @ 4.0 (9*450)....4x1GB DDR1066 Sapphire 4870.......500GB + 200GB HDD Add Newegg search to your Firefox!
	QUOTE Thanks

08-04-08, 09:43 AM	#2
CGR Member Join Date: Jan 2001 Location: Lower NY	Well, I like to keep as much dust/cat hair out of my machine as possible, so I try to maintain a slight positive pressure. If you are not worried about either, then negative pressure is ok __________________ Main System:.................................................. ......................Second System: DFI BloodIron P35-T2RL w/ Q6600 GO@ 3.2 (9x360), 1.4v....DFI Ultra-D w/Opteron 170 @ 2.7 G.skill 4GB (2x2gb).................................................. ..............G.Skill Extreme 2GB (2x1gb) HIS 4850 680/1108.................................................. .............Nvidia 7600GT WD VRaptor 300gb/Seagate 1TB..........................................Raptor 74gb/Seagate 200gb OCZ GameXtreme 600SLI
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08-04-08, 10:46 AM	#3
Adragontattoo Trailer Chasing Senior Join Date: Mar 2006 Location: 103 year old Victorian that I am renovat/moderniz-ing and fixing.	positive, my brain doesnt seem to work well in negative terms aka, I couldnt get the Stacker to cool well enough to my tastes without loading it down with High CFM fans. __________________ Only ISP provided, .EDU, .GOV, .MIL e-mail addresses are Classifieds approved. Are you unable to access the Classifieds? Click here to find out why! The Forum Rules FAQ\|Classies Rules and Regs Prices, slashes and edits Quality over Quantity Pictures are NOT req. Adopt an animal if you want one, dont use a breeder!
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08-04-08, 11:48 AM	#5
ihrsetrdr Senior Member Join Date: May 2005 Location: Phelan,Ca.	Dust accumulation is inevitable, when running fans. The primary function of fans is for cololing, so a slightly negative pressure would be better. __________________ ihrsetrdr aka Tim Be strong when you are weak, brave when you are scared, and humble when you are victorious. - Unknown
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08-04-08, 12:07 PM	#6
Brandontw Member Join Date: Mar 2005	I think the official opinion is that low pressure in the case is better for cooling, as there is always air flowing through rather than stagnant air sitting in the case. The dust thing is interesting though, i never thought about that.
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08-04-08, 01:48 PM	Thread Starter #7
Hitbox Member Join Date: Jun 2008 Location: Winter Park, FL	Regardless of dust. I'm obsessed enough about it to clean it out every couple of weeks. I'm mainly concerned about dead-spots in my case gathering pockets of heat. So it's better to have 3 fans pulling out and one pulling in? __________________ Windows 7 64-bit EVGA 750i FTW.......Silverstone KL02B-W E8400 @ 4.0 (9*450)....4x1GB DDR1066 Sapphire 4870.......500GB + 200GB HDD Add Newegg search to your Firefox!
	QUOTE Thanks

08-04-08, 03:22 PM	#8
netmask Member Join Date: Dec 2006 Location: Somewhere over the rainbow	IMO it's better to have 3 fans pulling out and 1 pulling in so it creates negative pressure forcing air to move in to cover the empty space of the air that's moving out than sucking it inside along with dust. __________________ Corsair HX750w Samsung 830 2x2gb Corsair Dominator GT 1600mhz 6-6-6-20 Asrock 890FX Dlx5 HIS IceQ 6970 AMD PhenomII X6 1075T Asus Xonar D2X PCI-E Cosmos 1000 windowed Logitech z5500 HP ZR24w 24"
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08-05-08, 12:37 AM	#10
SeraphNox Registered Join Date: Sep 2007	If I remember correctly, you'd want negative air pressure for a couple of reasons. For starters, less air means less humidity, although I don't think that plays a drastic role in this case but I guess it plays a role nonetheless. Also, air itself is an insulator; negative air pressure ensures that the heat can radiate more freely and in effect be pulled from the system much quicker. This in part is also due to the fact that when you create a negative pressure environment, you not only lower the amount of air in the case but the amount of energy. Finally, when air does enter to try and balance the pressure differences, it will expand which in turn lowers the air intake's temperature. I wrote this up at 1 in the morning so if anything seems amiss or just flat out wrong, just call me on it and I'll be sure to correct myself lol.
	QUOTE Thanks

08-05-08, 07:33 AM	#11
Diddyu Member Join Date: Dec 2007	Actually, the temp drop from the lower pressure will be insignificant (unless youre running a vaccum chamber) However, airflow is more turbulent when it is blown in instead of sucked in through rivets and seams, and more parts get cooled off, though YMMV. __________________ Mobo: XFX 680i LT CPU: Intel Q6600 G0 @ 3.8 ghz Cooling: Apogee GT + MCW60 RAM: OCZ SLI Ready 6400 @ 1000mhz 2 x 1gb Vid: 2x EVGA 8800GTS 512 (g92) @ 812/1035/2020 Case: NZXT Lexa Black PSU: Ultra Xfinity 600W 3dMark06:18356 marks
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08-05-08, 07:41 AM	Thread Starter #12
Hitbox Member Join Date: Jun 2008 Location: Winter Park, FL	------------------------------------------------------------------ Okay people, thanks for the advice. Negative it is! ------------------------------------------------------------------ __________________ Windows 7 64-bit EVGA 750i FTW.......Silverstone KL02B-W E8400 @ 4.0 (9*450)....4x1GB DDR1066 Sapphire 4870.......500GB + 200GB HDD Add Newegg search to your Firefox!
	QUOTE Thanks

08-05-08, 01:05 PM	#16
Micmal Member Join Date: May 2008 Location: Igloo Town, Canada	I have all intakes (4) with the rad blowing out(3). This is good for two things: Dust: The intakes are all filtered, so there should be no dust in the case, as any small gaps in the case will blow air out which will prevent unfiltered air from entering the case. More pressure on rad: I'm not sure if this has any effect, but from a logical stand point it does. Basically due to the case's internal pressure, air will naturally try to be pushed through the rad. the added pressure might help in clearing air through the rad. This gets me thinking, because I might actually be able to turn off the rad fans just because I have a positive case pressure as air will flow through it due to the pressure. __________________ Intel Core I7 2600K @ 4.9Ghz 4.04V \| GIGABYTE P67-UD4 \| G.Skill PC12800 16GB RAM 2x Asus 6870 @ 1000/1245 \| Corsair F120 \| Corsair HX650 Cosmos S -Painted Black CM Window Panel on front, modded Mesh panel on back Apogee XTL \| MCW60-R \| MCW82 -w/ Enzotech Ramsinks & Mosfetsinks MCP655 and MCRES-MICRO \| MCR320 -w/ 6 Yate Loon medium speed sleeved bearing
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