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28c - 30c idle? - Page 3

post #21 of 28
Quote:
Originally Posted by tweakboy View Post
Thats sweet, arjo, how did you get Ambient Room temp to show up ? ***, thats soo cool ?

Hey Rocker, just curious, nice rig btw, what is your 3dmark 06 score. Thanks
lol, i've mentioned before that I measure my ambient temps with a little digital thermometer on my desk... specifically it's the base unit of a LaCrosse Wireless Weather Station. It reads the humidity and temp from three remote sensors around the house and in the attic... as well as the readings located at the base on my desk.
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post #22 of 28
Quote:
Originally Posted by TnB= Gir View Post
then that program is reading your temps incorrectly. It's simple science....... You can't have lower than ambient temps on a cpu using air cooling.


The two fans on top are 120mm intake fans running @ 100% duty cycle. That fresh, cool air is then immediately forced across the fins of the TRUE via the 120mm fan strapped onto it and the warmed air is immediately expelled via the 120mm exhaust fan behind it.

The program is accurate, the sensor is correct - in this case it's the CPU's IHS sensor - it is reading at or just a hair below ambient temps. I'm pushing a lot of cooled air onto my cpu cooler and pretty much nothing else out of that little loop up there, but it works.

---
I'm not claiming that I have core temps at or below ambient, just the temp off the cpu's IHS. My cores are consistantly 15C higher than the CPU IHS value at idle and about 10C higher than the CPU IHS at load. The distance between the values goes down because the IHS gets hotter, faster under loads, obviously.

Someone mentioned using coretemp as a more accurate program to measure the temps. If they have a version out that doesn't require me to use an unsigned driver I'd be more than happy to give it a shot and snag a screenie... :shrug:


Simple science of the matter is that - for the "cpu temp" which is just off the IHS and is not the same as core temps, you can have a value lower than ambient. I have two 120mm fans 3" away from my TRUE pushing fresh air directly onto it. And on the TRUE there is another 120mm fan forcing that cool air across the fins and directly into the 120mm exhaust fan.
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post #23 of 28
Having any part of that system be lower temp than the air in your room is as impossible as impossible gets. It flies in the face of the very well tested, proven, and documented laws of thermal dynamics.

I would be more likely to believe someone who said they have flown to the moon and back on a fart powered go-kart.

There is an error in your temps somewhere. Either you are over estimating ambient temps a great deal, or CPU temps are being reported incorrectly.
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post #24 of 28
I believe the "ambient" sensor is reading the ambient in the case, and since the air going to the CPU cooler is mostly cool, fresh, air from outside the case, away from the ambient sensor, that it may be reading the IHS correctly.
post #25 of 28
That is a distinct possibility. However, the ambient that most of us are refering to is the room temp, or the temp of the air actually going into the heatsink.

Quote:
Originally Posted by arjo_reich
Someone mentioned using coretemp as a more accurate program to measure the temps. If they have a version out that doesn't require me to use an unsigned driver I'd be more than happy to give it a shot and snag a screenie... :shrug:
Unsigned drivers from widely used, reputable programs will not harm your system.

The cost to have a driver signed is a minimum of $10,000, if I remember correctly. Since CoreTemp is free, I doubt it's creator has 10 grand laying around to throw away on microsofts driver signature.
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post #26 of 28
Quote:
Originally Posted by grunion View Post
Your telling us your ambient temperature is ~95°f
and want us to believe your idle is 28-30°c?
Its 95 Degrees in your computer room ? You swaeta alot in there sounds like a sauna . I think you are reading something wrong
    
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post #27 of 28
Quote:
Originally Posted by Leck View Post
I ran Orthos for 18 hours

I've used Speedfan/MSI Utility/TAT/Coretemp

For some reason TAT and Coretemp double these temps so I don't know what to trust anymore.
just cause there higher temps doesn't mean you can ignore them sorry bud, but coretemp and TAT have it right.
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post #28 of 28
Quote:
Originally Posted by arjo_reich View Post

The two fans on top are 120mm intake fans running @ 100% duty cycle. That fresh, cool air is then immediately forced across the fins of the TRUE via the 120mm fan strapped onto it and the warmed air is immediately expelled via the 120mm exhaust fan behind it.

The program is accurate, the sensor is correct - in this case it's the CPU's IHS sensor - it is reading at or just a hair below ambient temps. I'm pushing a lot of cooled air onto my cpu cooler and pretty much nothing else out of that little loop up there, but it works.

---
I'm not claiming that I have core temps at or below ambient, just the temp off the cpu's IHS. My cores are consistantly 15C higher than the CPU IHS value at idle and about 10C higher than the CPU IHS at load. The distance between the values goes down because the IHS gets hotter, faster under loads, obviously.

Someone mentioned using coretemp as a more accurate program to measure the temps. If they have a version out that doesn't require me to use an unsigned driver I'd be more than happy to give it a shot and snag a screenie... :shrug:


Simple science of the matter is that - for the "cpu temp" which is just off the IHS and is not the same as core temps, you can have a value lower than ambient. I have two 120mm fans 3" away from my TRUE pushing fresh air directly onto it. And on the TRUE there is another 120mm fan forcing that cool air across the fins and directly into the 120mm exhaust fan.
Wow. You need to use your head. It is impossible to have your room hotter than your computer. Let me explain:

1. There is no cold, there is only a lack of heat

Let's say your room is 80f which is about 26c. The only thing your fans do is move air. Now let's pretend that your CPU isn't generating any heat (not possible), so it has less heat than the surrounding air, maybe it's 20c. Since your fans are running your CPUs heatsink is now working in reverse, it is blowing room temperature air (26c) over your 20c heatsink and CPU. The heatsink's heat from the room temperature air moves to the CPU because of diffusion, eventually heating up your CPU.

Now let's be more realistic and say your CPU is putting off heat and right now it's 35c. Because of diffusion the heat from your CPU moves to your heatsink because it has less heat. The air that also has less heat moves across your heatsink and becomes more warm. Now unless you have your thermostat (for your AC) in the same room as your computer, the room will just heat up until it is the same temperature as your CPU.

The air coming in isn't cooled, it's room temperature, which gets heated up more every second that your computer is on.
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