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[TN] Nathan
ALMIGHTY PWNER!
Joined: 14 Feb 2002
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 Posted: Thu Dec 04, 2003 3:24 pm Post subject: PROPER CPU COOLING! READ HERE! |
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Guys, lately I have seen a lot of people focusing on cooling their cpu and trying to get their temperatures as low as possible.
The one thing that you have to realize is that it's not the heatsink or the fan that makes the most difference, it's the temperature of the air used to cool the CPU.
Please get a case with at LEAST one 80mm intake and one exhaust to bring in cool air , and exhaust the hot air.
You will get lower temperatures with a crappy heatsink and a well ventilated case than a amazing heatsink cooling the CPU with 35-40 degree air.
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| Posted: Thu Dec 04, 2003 3:24 pm Post subject: Advertisement |
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bowmab
TweakNOOB
Joined: 22 Nov 2003
Posts: 23
Location: Australia
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| Posted: Thu Dec 04, 2003 11:56 pm Post subject: |
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| Agreed. At full load my P4 2.8c @ 3.5Ghz runs at 40c with stock standard heat sink. I would get it lower but due to where the comp needs to be placed I cannot get much more fresh air into it. In my old case with the same hardware it was running at about 50c at full load, 10degrees is a big difference from my point of view |
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diro
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Joined: 06 Nov 2003
Posts: 222
Location: Somewhere in the High Tech World
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| Posted: Sat Dec 06, 2003 9:05 am Post subject: Re: PROPER CPU COOLING! READ HERE! |
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| [TN] Nathan wrote: | Guys, lately I have seen a lot of people focusing on cooling their cpu and trying to get their temperatures as low as possible.
The one thing that you have to realize is that it's not the heatsink or the fan that makes the most difference, it's the temperature of the air used to cool the CPU.
Please get a case with at LEAST one 80mm intake and one exhaust to bring in cool air , and exhaust the hot air.
You will get lower temperatures with a crappy heatsink and a well ventilated case than a amazing heatsink cooling the CPU with 35-40 degree air. |
Seconded
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PolarPyro
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Joined: 10 Oct 2003
Posts: 1101
Location: snoresville usa
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| Posted: Sat Dec 06, 2003 11:45 am Post subject: Re: PROPER CPU COOLING! READ HERE! |
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| [TN] Nathan wrote: | Guys, lately I have seen a lot of people focusing on cooling their cpu and trying to get their temperatures as low as possible.
The one thing that you have to realize is that it's not the heatsink or the fan that makes the most difference, it's the temperature of the air used to cool the CPU.
Please get a case with at LEAST one 80mm intake and one exhaust to bring in cool air , and exhaust the hot air.
You will get lower temperatures with a crappy heatsink and a well ventilated case than a amazing heatsink cooling the CPU with 35-40 degree air. |
thirded 
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Wackjob
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Joined: 28 Oct 2003
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| Posted: Sat Dec 06, 2003 7:59 pm Post subject: Re: PROPER CPU COOLING! READ HERE! |
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| [TN] Nathan wrote: | Guys, lately I have seen a lot of people focusing on cooling their cpu and trying to get their temperatures as low as possible.
The one thing that you have to realize is that it's not the heatsink or the fan that makes the most difference, it's the temperature of the air used to cool the CPU.
Please get a case with at LEAST one 80mm intake and one exhaust to bring in cool air , and exhaust the hot air.
You will get lower temperatures with a crappy heatsink and a well ventilated case than a amazing heatsink cooling the CPU with 35-40 degree air. |
Fourthded. (?) I couldn't believe the difference adding 2 more fans to my case made, but the temps were still higher then they are now that the weather is cooling off. Southern Arizona is still hot though. It's ridiculous. |
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[TN] Nathan
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[KoG]^weaZel
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Joined: 31 Oct 2003
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| Posted: Wed Jan 07, 2004 4:45 pm Post subject: |
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would ducting bringing cold air in from the 'frig help?
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-verTo-
SirTweaksabit
Joined: 29 Oct 2003
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| Posted: Fri Jan 09, 2004 5:03 pm Post subject: |
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fridge* ?
yeah i thought about doing that.. but parents would probably get mad at me for hacking a hole into it. Then i'd have to replace it.. and .. yeah..
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gERm
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Joined: 10 Jan 2004
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| Posted: Sat Jan 10, 2004 11:30 am Post subject: |
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2 80mm case fans, open side, 92 mm Vantec tornado (119 cfm), box fan and a swiftech MCX478-V....the way to go!!
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[KoG]^weaZel
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| Posted: Sat Jan 10, 2004 1:17 pm Post subject: |
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| -verTo- wrote: | fridge* ?
yeah i thought about doing that.. but parents would probably get mad at me for hacking a hole into it. Then i'd have to replace it.. and .. yeah.. |
thank you for the correction! 
I think the only problem with that idea is the fridge's ability to cool the air.
From what I have been reading in this forum the best cooling is to live in Canada and keep your comp in the basement with the A/C running. But since I don't I will stick with my H2O and will upgrade to a dual 120mm radiator.
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-verTo-
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| Posted: Sat Jan 17, 2004 10:27 pm Post subject: |
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All that electricity wasted on A/C to keep the CPU cool? Man, i'd rather go buy me a prometeia!
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[TN] Nathan
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| Posted: Sun Jan 18, 2004 9:53 am Post subject: |
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Also, keep your case side on to allow for proper airflow.
Open cases don't allow for airflow through the case and your cooling will be actually worse.
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ToggleHead
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Joined: 03 Mar 2004
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| Posted: Thu Mar 04, 2004 8:32 am Post subject: |
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i second that nathan....i have 7 case fans in my box and not the best heat sink ....but my p4 3.0@3.9 is running at a solid 29 deg celcius.......airflow is KEY.....=]
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Alchy
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Joined: 13 Apr 2004
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| Posted: Tue Apr 13, 2004 5:39 pm Post subject: |
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| [TN] Nathan wrote: | | Open cases don't allow for airflow through the case and your cooling will be actually worse. |
Not necessarily, and certainly not in all cases. There are a large number of variables such as ambient room temperature, case size, cable positioning etc that mean that closed cases can be hotter than open ones. Certainly lage items like the cpu often read benefits in temp readings from being open to room airflow.
As a rule, a well designed air flow system will be better than having the side off, but a poorly laid-out case (with tangles of wires and incorrect fan placement) will be much worse, and can be pretty dangerous. |
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meobius
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Joined: 02 Sep 2003
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| Posted: Tue Apr 13, 2004 5:49 pm Post subject: |
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something that is pretty good is the Sunbeam Overclocking kit...
it's a tube that goes from the front of the case to the cpu... can drop the board and the cpu up to 15 degrees..
i thought it was bull crud till i tried it... and surprisingly it does exactly as it says it does... can't keep it in though cause i use a 120mm in the front, but for those of you with 80mm in front and an 80mm cpu fan... its golden. |
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[TN] Nathan
ALMIGHTY PWNER!
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| Posted: Wed Apr 14, 2004 12:56 am Post subject: |
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| Alchy wrote: | | [TN] Nathan wrote: | | Open cases don't allow for airflow through the case and your cooling will be actually worse. |
Not necessarily, and certainly not in all cases. There are a large number of variables such as ambient room temperature, case size, cable positioning etc that mean that closed cases can be hotter than open ones. Certainly lage items like the cpu often read benefits in temp readings from being open to room airflow.
As a rule, a well designed air flow system will be better than having the side off, but a poorly laid-out case (with tangles of wires and incorrect fan placement) will be much worse, and can be pretty dangerous. |
Yes, that is the way it is.
With the case side on you develop dead pockets of warm air with no air movement.
With case side on your force the air flow paths to form.
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Alchy
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Joined: 13 Apr 2004
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| Posted: Thu Apr 15, 2004 7:54 am Post subject: |
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| meobius wrote: | something that is pretty good is the Sunbeam Overclocking kit...
it's a tube that goes from the front of the case to the cpu... can drop the board and the cpu up to 15 degrees..
i thought it was bull crud till i tried it... and surprisingly it does exactly as it says it does... can't keep it in though cause i use a 120mm in the front, but for those of you with 80mm in front and an 80mm cpu fan... its golden. |
Really? I'd had those things down as another worthless OC-tool scam. What temp differences did you observe?
If it works well I'll make my own, probably... |
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[TN] Nathan
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cla9614
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Joined: 24 Aug 2004
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| Posted: Wed Aug 25, 2004 1:11 am Post subject: |
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Well.....i have studied heat tranfer and thermodynamics in college (yes i graduated with an engineering degree) and without putting you through a rigirous science lesson getting the largest amount of ambient cool air to flow around your processor is key. If the delta T (thats the temperature difference) is great, you wont have to move nearly as much slightly warmer air to lose Q (thats the heat). Remember -dQ/dt = m*c*-deltaT where m is the mass flow rate of air, or in this case, we could use the densiy * the volumetric flow rate of air. Additionally, this assumes that you have identical heat sinks (surface area for heat transfer) and a plethora of other variables (set up identically). Well NE way.....just get the coolest air possible, moving at a high volumetric flow rate through / around that processor......trust me !!!
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[TN] Nathan
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| Posted: Wed Aug 25, 2004 1:53 am Post subject: |
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Yes, but remember, the CPU is only one part of a computer.
Cooling a CPU properly and having the rest overheat is not beneficial at all.
Oddly enough, you don't have to have a terrible amount of airflow for good cooling. What you need to find out is how to exhaust the heat as fast as possible before it contributes to case temperatures.
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JayDubya
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Joined: 01 Oct 2003
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| Posted: Wed Aug 25, 2004 6:26 am Post subject: |
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| [TN] Nathan wrote: |
Oddly enough, you don't have to have a terrible amount of airflow for good cooling. What you need to find out is how to exhaust the heat as fast as possible before it contributes to case temperatures. |
Quoted for practicality.
You are very knowledgeable, CLA. You must not forget, like Nathan said, you need to cool all your components and not just your processor. It doesn't have to be a wind tunnel either.
I have one good case with an 80mm exhaust fan in the back and a 92mm blowhole. It cools better than my bigger case with 2-80mm exhausts, 1 80mm blowhole, and 2 80mm intakes.
Its all about proper airflow and not just massive airflow. The first said case was extremely well designed while the second is much less than perfect.
As soon as all the components are switched, the same result is seen.
I'm sure SS will agree that the heat transfer equations are somewhat screwed when it comes to proper airflow inside a computer.
You are correct in assuming that more air flow usually results in better cooling but there are certain cases ( < I made a pun) in which it does not. You are very knowledgeable and I hope you stick around to spread that wisdom!
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Silicon Skum
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Joined: 26 Jul 2004
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| Posted: Wed Aug 25, 2004 4:51 pm Post subject: |
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| JayDubya wrote: |
Its all about proper airflow and not just massive airflow. The first said case was extremely well designed while the second is much less than perfect.
As soon as all the components are switched, the same result is seen.
I'm sure SS will agree that the heat transfer equations are somewhat screwed when it comes to proper airflow inside a computer.
You are correct in assuming that more air flow usually results in better cooling but there are certain cases ( < I made a pun) in which it does not. You are very knowledgeable and I hope you stick around to spread that wisdom! |
Indeed I do agree! You could have a fan the size of a car radiator fan and you would still have the same temps, the cooling process is governed by the amount of humidity in the air, the heat must have a transport to conduct it away. If you are blowing warmed air (which may also be less humid and certainly less dense) over a device that radiates heat, you will not see any benifit from a bigger fan. Also the temperature of the air charge is important, if the air is warmer than the source to be cooled, the source will warm up to that temperature and increase further until an equilibrium is achieved where by the amount of heat generated is sustained at a constant temperature by the available level of conduction of heat by the air charge.
There are equations to explain this more clearly, but not all people reading this will understand and I happen to be dyscalculic (mathematical dyslexia) so I use an explanation.
So in other words, you would just be blowing warm air around the case and not helping to cool the components. the airflow would stagnate and just increase the heat problem.
Cool, dense humid air is the key to lowering temps.
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2old2care
Lord of the Tweak
Joined: 09 Jul 2004
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| Posted: Wed Aug 25, 2004 5:20 pm Post subject: |
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| Silicon Skum wrote: |
Cool, dense humid air is the key to lowering temps.
SS |
Another good reason for aluminum cases. Humidity + Iron = Rust
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JayDubya
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| Posted: Wed Aug 25, 2004 6:32 pm Post subject: |
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| Silicon Skum wrote: | the cooling process is governed by the amount of humidity in the air, the heat must have a transport to conduct it away
SS |
Quoted for absolute validity! < That Scum is right
Don't count out stainless steel though, 2O2C. Good quality stainless steel is nothing to be afraid of.
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2old2care
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| Posted: Wed Aug 25, 2004 6:40 pm Post subject: |
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| JayDubya wrote: | | Don't count out stainless steel though, 2O2C. Good quality stainless steel is nothing to be afraid of. |
Didn't think of stainless. 
Good sstl won't rust (cheap will) Haven't seen to many 18/8 stainless cases though. Would be bitchin.
A tad heavy perhaps. 
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