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Geek Culture / CPU Temp vs Room Temp

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The Lone Programmer
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Joined: 29th Jan 2003
Location: California, USA
Posted: 17th Jun 2006 19:19
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Guys,
I've been doing some thinking about CPU temperatures on custom built computers.

Everyone in product reviews and forum boards always claim to have such an incredibly low CPU temperature. Even people with my same exact CPU claim to have a temperature of 20C to 30C below what mine is.

My CPU runs at 50C on idle and 60C on load. People with my same CPU claim they are running at 20C idle and 30C load. They have the same heatsink fans as me and case fans as me.

Now it is normally 85F+ inside my house. We don't use the air conditioner. So normally it is 85F in the morning and then it reaches 95+ in the afternoon. I am not sure what those temperatures are in Celsius.

Now when my computer fans work, they are sucking in and removing all that hot air that remains in my room. I figure that if you take hot air and blow it onto a hot object, it will only get hotter or remain the same temperature. Is that the case? I mean is my CPU temperature so high because of my room temperature?

I would really like to know how people with the same fans, and CPU as me manage to obtain a 20C idle. My heatsink is properly installed and my thermal paste used is Arctic Silver. I mean I just don't understand.

Is there any way that the people making these low temperature remarks have a house of like 65F - 70F? One that has a normal or below normal temperature?

I know some people in the forums have replied to my other posts about home brew computers.

Can everyone who built a custom computer and is reading this post please post these things:
1> CPU Type (AMD or INTEL)
2> CPU Speed
3> CPU Temperature
4> Room Temperature

From that I could do my own little analysis on why everyones CPU temperature is lower than mine. But if anyone should know than please post your reasons.

My specs are:
- Intel Pentium D 930 3.0ghz (Don't harass me about INTEL)
- Arctic Cooler Professional 7 Heatsink


I appreciate the help,
The Lone Programmer

"Is The Juice Worth The Squeeze"
-The Girl Next Door
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spooky
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Joined: 30th Aug 2002
Location: United Kingdom
Posted: 17th Jun 2006 22:52 Edited at: 17th Jun 2006 22:53
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AMD Athlon XP 2000

CPU Temp is currently 57C and room temp is 26C - it is very hot though in the UK at the minute. Under load the CPU temp rockets up 67C.

On average the room temp is around 18-20C and the CPU temp hovers around 50C with load temp around 60C

People claiming 20C and 30C sounds like bull to me.

Boo!
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EddieB
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Posted: 17th Jun 2006 23:21
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@The Lone Programmer

I have the same CPU as you, and I get about the same results as spooky
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The Lone Programmer
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Location: California, USA
Posted: 17th Jun 2006 23:48
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EddieB
Intel sent me an email saying that for my CPU the critical temperature is 63C. If you are getting the same results as Spooky I would be concerned.

Spooky
I thought I remembered reading that AMD's critical temperature is 55C. That is very bad for you. Sounds like your running kind of hot if your room temperature is only at 26C. But then again I could be wrong.


I appreciate your guys input. I am just trying to get to the bottom of this subject. Find out why my temperature is not as low as others. I know in Intel's email they told me they couldn't do anything about my problem. The only thing they said was to make sure it was firmly attached. Also in the email they said my model CPU is suppose to run idle at 30C. So I don't know what kind of drugs everyone is smoking and why the CPU's creator can't help me.

Honestly I probably wont be happy with my CPU until my CPU remains constantly the same or below 15C from its critical temperature. In my case I wont be happy until it runs 45C and below constantly.


Please keep up the input so maybe I can get an idea on how to get CPU temp down.

Thanks,
The Lone Programmer

"Is The Juice Worth The Squeeze"
-The Girl Next Door
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EddieB
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Posted: 17th Jun 2006 23:53
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LOL, Speed fan was displaying around 50 - 55c in the task bar... I think that's cpu temp.

Im getting a new CPU soon anywhoo..
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Nicholas Thompson
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Location: Bognor Regis, UK
Posted: 18th Jun 2006 00:21
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I heard that AMD's critial temperature is about 80 to 85C... Mine idles at 33 and tops at 40. The room is currently 28C. I have a 4400+ Athlon64 X2 with stock heatsink.

Another contributing factor is the case material (aliminium or steel) plus the sir flow inside the case.

[center]
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Fallout
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Location: Basingstoke, England
Posted: 18th Jun 2006 00:39 Edited at: 18th Jun 2006 00:48
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Where do I read the temp? In the bios?

Ok, went into Bios. 37-38C fluctuating. 28C in the room. AMD4000+

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FINN MAN
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Posted: 18th Jun 2006 01:07
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The Lone Programmer if you want to get your temp down use a liquid system, they are much quieter and keep every thing very cool. Remember every one is always saying that there system runs better then it really does to make them self fell cool or something, so they may be getting much higher temps. Also if you don't want to put out the cache for liquid cooling see if you can get some nice case fans. Or take off your side panel and run a desk fan on the system.

http://www.militaryfreezone.org/

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spooky
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Posted: 18th Jun 2006 01:51
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Athlon XP2000+ critical temp is 90degC and is one of the highest around, so running at 50-60 is no problem and apparently quite the norm for that processor. System has been incredibly stable for the 4 years I've had it. It used to run a little bit cooler but I replaced the fan on the graphics card with a zalman heatpipe thing, and also replaced the fan on cpu for a quieter one as the noise was driving me bonkers. It's lovely and quiet now.

Boo!
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The Lone Programmer
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Posted: 18th Jun 2006 02:06
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EddieB
Are you being serious that your going to get a new CPU soon? The CPU I have just came out not too long ago. I don't even think its been around a year. You claim to have the same one I have.

Finn Man
I probably will not go for liquid cooling as it holds too much of a risk for me. I do not want it to leak and destroy my system. Sure they are more improved and probably will never leak anymore, but that doesn't mean it's not possible. It's just too much money for me to burn away if there is a problem.

Spooky
Are you serious with these CPU temperature specs? I thought that Intel had a much greater heat tolerance than AMD. Maybe you have one of the newest model CPUs? 90C is quite high for a temperature. That is pretty awesome you can maintain a low temperature with the stock fan. Will never see that happen with an Intel.

Nicholas Thompson
You say the case material holds a factor. I did not know this. My case material is Aluminum. Is that better than steel and plastic. To be specific this is my case. http://www.newegg.com/product/product.asp?item=N82E16811119077
Supposively it is suppose to be one of the better cases for keeping your computer cool with lots of airflow.


It was recommended to me to buy 'Blue Tack' which is a sticky adhesive. I was told to get that and use it to stick fans inside my case. I know of at least two good locations to stick fans inside my case that don't have proper hookup points. So this 'Blue Tack' may be of some good use to me.

I will probably replace all (2) of my stock case fans as well. Hopefully I will then have four awesome fans in my PC.

Do you guys think that will help with my heat issue? Should I shop for fans by Airflow or RPM or Both?


Keep posting your idea's on why my PC runs so hot.

Thanks,
The Lone Programmer

"Is The Juice Worth The Squeeze"
-The Girl Next Door
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CattleRustler
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Posted: 18th Jun 2006 02:36
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i only skimmed the above but I can say for sure that room temp affects cpu temp. my office is in the top of the house and it an get to 90F in here in the summer without ac. If I turn on my pc and ac at same time (say with room at 80F) the fan rpms go way up and hit a very noticable pitch. As the ac cools the room down the pc fans rpms will slow and the pitch of the fans will drop. when the room is 70-72F the fans are noticably quieter than when the room temp goes above 74. mind you i am only talking about the known room temps and the fan pitch - i cba to look at the actual cpu celcius readings.

short answer: cooler room = cooler pc

Science, Mathematics, and Physics do not lie - only people do.
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Lost in Thought
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Posted: 18th Jun 2006 13:08
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There should only be around a 10C difference from your system temp to your processor temp at idle if your heatsink and fan is correct. Note Artic silver or such works alot better than the thermal pad that comes with the heatsink. I had about a 20C difference with the thermal pad as opposed to the 10C with arctic silver.

My temps are as follows.
Room temp: 23C/ 73-74F
System(case air) temp: 36C/ 98.6F
Processor idle: 44C/ 111F
Processor 50% load: 55C/ 131F

Max temp on my processor is 75C though I wouldn't want to ever go over 60C and the case temp recommendation is around 40C so I'm below that.

And this is with one of my exit fans out of the case (leaving only the Processor, video card, power supply, and entrance air fans). With the extra fan the room and system temps arealot closer to the same and thus brings the processor temo down to match.

It's best to go to the processor's manufacturer (website) and get the specs.

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EddieB
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Posted: 18th Jun 2006 13:15
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Ah I see LOL! You have a Pentium D ..

Pentium 4 CPU, 3GHz Is what My pc stats is saying...I have had it for about 3 years now :/
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Neofish
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Posted: 18th Jun 2006 13:22
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I have the same cpu and motherboard as a friend on irc and mine runs a whole 10C cooler, this is probably due to it being cooler in the UK but I'm pretty sure they can vary : you can be lucky or not

Also : 20C cpu with OCing is insane, really not possible without water cooling or amazing air cooling (ie with tubes n crap).. 30C without OCing is believable beacuse i have one (overclocked it goes up about 5 degrees before kicking out due to going too high).

New site!
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indi
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Location: Earth, Brisbane, Australia
Posted: 18th Jun 2006 13:26 Edited at: 18th Jun 2006 13:26
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my 2nd cpu always reads a little more however that makes no sense if most of the work is on the first cpu. this machine is twin water/fan cooled




g5 dual 2.5ghz

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Fallout
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Posted: 18th Jun 2006 13:44
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It could be quality differences in the CPUs. I heard that CPUs of the same technology but different MHz ratings are manufactured in exactly the same way. The final CPUs are then tested and categorized based on performance and sold, hence why your CPU might be reported as +/- 20 mhz or whatever on start-up.

I don't know how true that is, but if it is true it'd add weight to the argument that the CPUs aren't identical, and depending on materials and other factors used, one CPU might be slightly better engineered than another. A few narrower conductors here and there or slight inconsistencies in the construction could result in different heat readings.

Once again, just guessing at this based on what I've heard. Sounds reasonably plausible to me.

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indi
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Posted: 18th Jun 2006 14:55
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sounds feasible, I had to have one replaced, perhaps the replacement is a newer model of manufacturer

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