How cold is TOO cold?

[JoePro87]

Okay, just added another case fan to my computer, and HOLY BALLS EVERYTHING IS RUNNING SO COLD NOW! Like, seriously, my CPU temps are lower than my room temps.  At what point should I be worried? I know if things drop below freezing, it can be an issue, but I'm not in danger of that happening anytime too soon.

 

Anyway, CPU temps are currently 11C at idle, 20C after running Heaven Benchmark. 

Is this normal? Should I just count myself lucky?

 

[DominicNikon]

your cpu cant go below room temperature if your on air. most of the time you need liquid nitrogen or a phase cooler to go below room temp. so you sure the temps are right?

[mikat]

below room temperature can cause condensation and that's bad

[Zeinone]

Heat it up so it doesn't freeze

[thekeemo]

Literally impossible without phases cooling dice or Ln2 etc

[don_svetlio]

Going under room temp on air is physically impossible. You probably have a bad sensor or a VERY cold room

[don_svetlio]

FYI - Heaven doesn't stress the CPU at ALL. Run Intel Burn test for CPU temps

[Kobathor]

What everybody above me has said- on air or water cooling it's impossible for your temps to be colder than your room temperature, temps below room temperature can only be obtained with Ln2 or phase change cooling. What CPU do you have?

[JoePro87]

2 minutes ago, Kobathor said:

What everybody above me has said- on air or water cooling it's impossible for your temps to be colder than your room temperature, temps below room temperature can only be obtained with Ln2 or phase change cooling. What CPU do you have?

I find it funny that you all say that it is impossible to go below room temps on just air cooling...because...that's what is happening. Anyway, at idle, CPU is pushing 11C, which is 51 degrees. Is it possible my sensor is bad? Sure. Is it possible that me having my computer on the ground makes it more probable that that is where the air is cooler (considering heat rises), sure! Ambient room temp, according to a thermometer in my living room, says it is 67F. 

 

So...also, considering I never have had my CPU run this cool before, I'm guessing the sensor isn't bad. It normally rests somewhere around the 50C mark. And btw, I have an AMD FX-8300. 

 

So...it's possible somehow the sensor JUST went bad...but that seems like a bit of a stretch to me.

[JoePro87]

Oh, and I'm going to run Intel Burntest. I'll post results when it is done.

[JoePro87]

Completed 2 passes. Went up to 42C. Going to test it on higher settings.

[ThinkWithPortals]

1 minute ago, JoePro87 said:

 

The thermal sensor could well be off. The system can't run cooler than the air that it's being cooled with, them's the laws of physics. If the sensor is correct then your room temps must be cooler than the system.

It's literally not physically possible for your CPU to be colder than ambient temps, it's a scientific law.

 

[Kobathor]

2 minutes ago, JoePro87 said:

I find it funny that you all say that it is impossible to go below room temps on just air cooling...because...that's what is happening. Anyway, at idle, CPU is pushing 11C, which is 51 degrees. Is it possible my sensor is bad? Sure. Is it possible that me having my computer on the ground makes it more probable that that is where the air is cooler (considering heat rises), sure! Ambient room temp, according to a thermometer in my living room, says it is 67F. 

So...also, considering I never have had my CPU run this cool before, I'm guessing the sensor isn't bad. It normally rests somewhere around the 50C mark. And btw, I have an AMD FX-8300. 

So...it's possible somehow the sensor JUST went bad...but that seems like a bit of a stretch to me.

AMD FX CPU's like the 8300 don't actually have a thermometer, it uses an algorithm to calculate temperatures when under load. My old 8350 would report temps below 20C all the time at idle, since the algorithm is very inaccurate at idle, but under load it was a more reasonable 57C or so.

[JoePro87]

3 minutes ago, Kobathor said:

AMD FX CPU's like the 8300 don't actually have a thermometer, it uses an algorithm to calculate temperatures when under load. My old 8350 would report temps below 20C all the time at idle, since the algorithm is very inaccurate at idle, but under load it was a more reasonable 57C or so.

Now that I would believe.

 

3 minutes ago, ThinkWithPortals said:

The thermal sensor could well be off. The system can't run cooler than the air that it's being cooled with, them's the laws of physics. If the sensor is correct then your room temps must be cooler than the system.

It's literally not physically possible for your CPU to be colder than ambient temps, it's a scientific law.

 

In regards to this, think about just a standard house fan in your room. It blows the air around...and cools things off. It must be MAGIC. Obviously just a fan won't cool down the air by like 50 degrees or anything, but with this case fan running at max speed (which it is, because I totally jerry rigged this thing), 10 degrees below room temps isn't that hard to believe.

[Kobathor]

Just now, JoePro87 said:

Now that I would believe.

I thought there was an AMD article on it, but I couldn't find it on Google. But yeah, at idle temps will drop/raise at insane rates, and it's not very accurate.

[JoePro87]

4 tests in, and the highest I've seen so far is 54C

[ThinkWithPortals]

8 minutes ago, JoePro87 said:

In regards to this, think about just a standard house fan in your room. It blows the air around...and cools things off. It must be MAGIC. Obviously just a fan won't cool down the air by like 50 degrees or anything, but with this case fan running at max speed (which it is, because I totally jerry rigged this thing), 10 degrees below room temps isn't that hard to believe.

10 degrees below idle is impossible.

A fan cools you down due to evaporative cooling, whereby the sweat on your skin can evaporate.

If it was at all possible to cool something below room temp with only a fan and heatsink then there would be no problem with cooling normal objects at normal room temperature to below freezing, but that's impossible. That's why things like fridges and freezers need complex systems involving condensers and coolant loops to cool their insides lower than ambient temp. If it was possible to do that with just a fan, we wouldn't need all that. But it's not possible.

 

This is simple thermodynamics, dude. A simple fan+heatsink cannot cool below ambient temps.

[JoePro87]

1 minute ago, ThinkWithPortals said:

10 degrees below idle is impossible.

A fan cools you down due to evaporative cooling, whereby the sweat on your skin can evaporate.

If it was at all possible to cool something below room temp with only a fan and heatsink then there would be no problem with cooling normal objects at normal room temperature to below freezing, but that;s impossible. That's why things like fridges and freezers need complex systems involving condensors and coolant loops to cool their insides lower than ambient temp. If it was possible to do that with just a fan, we wouldn't need all that. But it's not possible.

 

This is simple thermodynamics, dude. A simple fan+heatsink cannot cool below ambient temps.

Look,. I honestly couldn't give a shit less. The issue was already solved. The FX processors use an algorithm to determine temps, they don't have actual sensors inside the CPU. Stop trying to be a big boy and win an argument that no one cares about. Just drop it.

 

Anyway, after running the test on the maximum settings, the highest I got was 55C. Does that seem more reasonable, all things considered? Or, should the intel burn in test be pushing it a lot higher than this? 

[vong]

4 minutes ago, JoePro87 said:

Look,. I honestly couldn't give a shit less. The issue was already solved. The FX processors use an algorithm to determine temps, they don't have actual sensors inside the CPU. Stop trying to be a big boy and win an argument that no one cares about. Just drop it.

 

Anyway, after running the test on the maximum settings, the highest I got was 55C. Does that seem more reasonable, all things considered? Or, should the intel burn in test be pushing it a lot higher than this? 

Geez, could you be anymore butthurt?

You just spewed up what Kobathor fed you...

[ThinkWithPortals]

Just now, JoePro87 said:

Look,. I honestly couldn't give a shit less. The issue was already solved. The FX processors use an algorithm to determine temps, they don't have actual sensors inside the CPU. Stop trying to be a big boy and win an argument that no one cares about. Just drop it.

 

Anyway, after running the test on the maximum settings, the highest I got was 55C. Does that seem more reasonable, all things considered? Or, should the intel burn in test be pushing it a lot higher than this? 

A temp of 55 degrees seems fairly normal, I'd be willing to accept that as genuine.

 

And there's no need to get like that. You're just butthurt you got corrected.

[Seminole]

With air cooling it's nearly impossible for your CPU to dip below room temperature. The air is only dissipating the heat generated, it can't dissipate more heat than the area around it unless you dissipated it in such a short burst that the ambient temperature just couldn't handle the drop in temperature any more.

But obviously you can't experience that with a CPU fan lol. I have seen something that explains this about computers, essentially what is happening is your computer is reading the temperatures differently from how they are supposed to be read or something like that. I forgot how it worked, I'm sure someone else knows what I'm talking about.

3 minutes ago, JoePro87 said:

Look,. I honestly couldn't give a shit less. The issue was already solved. The FX processors use an algorithm to determine temps, they don't have actual sensors inside the CPU. Stop trying to be a big boy and win an argument that no one cares about. Just drop it.

 

Anyway, after running the test on the maximum settings, the highest I got was 55C. Does that seem more reasonable, all things considered? Or, should the intel burn in test be pushing it a lot higher than this? 

Just as I was almost done writing this haha  yeah 55c is pretty average. I'm guessing you're still seeing that some of the cores are still 0-11c though? Unless you fixed that. I'd like to hear how you got around it

[Mikius10001]

Hey Mr. Pro over here @JoePro87, he's not trying to win an argument that no one cares about, that's you my good man. He's simply explaining the science that is clearly above your head so chill out, he's trying to teach you. Really, you should be grateful. Most people would just call you an idiot and move on...

 

@ThinkWithPortals

[ThinkWithPortals]

Just now, Mikius10001 said:

Hey Mr. Pro over here @JoePro87, he's not trying to win an argument that no one cares about, that's you my good man. He's simply explaining the science that is clearly above your head so chill out, he's trying to teach you Really, you should be grateful. Most people would just call you an idiot and move on...

 

@ThinkWithPortals

Cheers mate.

[JoePro87]

You know what? For my own sake, and to not get anymore warning points, I'm just closing this thread before I say something I'll regret.

[Seminole]

4 minutes ago, Mikius10001 said:

Hey Mr. Pro over here @JoePro87, he's not trying to win an argument that no one cares about, that's you my good man. He's simply explaining the science that is clearly above your head so chill out, he's trying to teach you. Really, you should be grateful. Most people would just call you an idiot and move on...

 

@ThinkWithPortals

"This is simple thermodynamics, dude. A simple fan+heatsink cannot cool below ambient temps."

 

In my opinion that sounds like he's just trying to start an argument lol I wouldn't be grateful for that.

 

"10 degrees below idle is impossible.
A fan cools you down due to evaporative cooling, whereby the sweat on your skin can evaporate."

@ThinkWithPortals

 

Just saying... evaporative cooling doesn't apply to air cooling at all. Air cooling is just insulation and conduction at work. By blasting insulating air at the conductive CPU you dissipate the heat.

 

What I'm trying to point out is there's no reason to pick a fight with JoePro. He was just asking a question.