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Temperature of my i5-4570

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  • CPUs
  • Temperature
Last response: in CPUs
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August 2, 2014 2:24:43 AM

So whenever I start my computer and go to the BIOS, it shows that my CPU is at 40 degrees (Celcius) or so. Depending of the weather ofcourse. Probably because of the temperature, all my fans are working at ca 1000 RPM. But they are set to Silent profile.

Now when I start up my Windows 8 partition, the fan speed stays the same for some time, but when the log in screen appears, suddenly fans stop. I open up my SpeedFan program and look at the temperatures. CPU is now at 25 degrees when IDLE. Case fans are about 0-500 RPM. Can not even hear them.

Now when I load up my Ubuntu linux partition, and after I log in, this kind of change does not happen. CPU usage is at IDLE, somewhere between 0 and 6%. so the temperature should be just the same that it is on Windows 8. But it is not. It is just like my BIOS shows it is. About 40 degrees.

Now this in turn makes the fans move at a higher speed too because the system knows that CPU is hot and wants to cool it down. But I think it is not normal that I need to have my fans at almoust max speed during the time my computer is basically idle. Impossible to watch a movie on Linux for instance because the fan noise just goes over it.

So does anyone have an idea how Windows 8 just magically gets my CPU to be at 25 degrees and even BIOS shows that it is 40 degrees hot? I mean, if you look around the web how cool that CPU should be, it is say'd also that it should be 25 idle and 40-60 on load.

Also if any other info is needed about the problem, please let me know and I will provide it.

More about : temperature 4570

August 2, 2014 2:58:21 AM

the bios tempretures are not accurate.
i think its the same with the fan speed
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August 2, 2014 4:20:02 AM

So bios reads my fan temps wrong and then puts fan speed wrong according to it also? And Linux reads all the info from the same route that my BIOS does?
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August 2, 2014 5:16:15 AM

yes, the temps are wrong. but i dont think the fan speed is.
yeah its seems like it do take info from bios.
here are can you see the temps on linux: http://www.youtube.com/watch?v=-AGZz_9wAMI

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August 2, 2014 5:28:47 AM

But why does the BIOS show wrong temps, should I flash it to a newer version or is it like that with all BIOS ?
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August 2, 2014 7:41:03 AM

I read around and stumbled accross something like this:

Quote:
I did a bit of reading on other forums when I ran into the high BIOS temperature and came across two valid explanations.

The first being that running the UEFI BIOS puts quite a bit of load on the CPU and second that the CPU's power saving features, like downclocking to 1.6Ghz and lowering V-core doesn't take affect until Windows is loaded. Thus leading to the high BIOS temperatures we're seeing with SandyBridge CPU's.

Would this be achievable on Linux too? Because obviously it does not do it on Linux as the CPU temps stay the same at idle.
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