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CPU temps way too low and fluctuating unrealistically (this is definitely a mobo issue)

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  • Motherboards
  • CPUs
Last response: in Motherboards
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May 6, 2013 9:03:29 AM

I recently replaced my motherboard, cpu, and memory, getting a 990fx ud3 from gigabyte and an fx-4300 cpu. In bios and in every hardware monitor I've ran, I get cpu temps as low as 4 degrees celsius, which is ridiculous. I can run prime95 and almost get it up to 30, and then it immediately drops down to around 10 degrees once it's shut off. Using the Dark Knight II Night Hawk Edition cooler from Xigmatek. I tried using a different cpu and got the same problems, so it's looking like it's definitely a mobo problem. What do I try next?

More about : cpu temps low fluctuating unrealistically mobo issue

May 6, 2013 9:08:30 AM

Wow, im running at 94 degrees at 100% load on my GPU, I wish I can give you some heat for some of your cold.

But honestly this must be a sensor problem within the video card itself
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May 6, 2013 9:16:15 AM

where do you live exactly. 15-20 was normal but 4? my CPU reaches 80+ on heavy loads yeat yours is 30 c which i believe is impossible for my pc to reach even at.
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May 6, 2013 9:22:27 AM

thasan1 said:
where do you live exactly. 15-20 was normal but 4? my CPU reaches 80+ on heavy loads yeat yours is 30 c which i believe is impossible for my pc to reach even at.


15-20 is normal for you? My rooms ambient temps are higher
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May 6, 2013 9:26:44 AM

Randy Appo said:
thasan1 said:
where do you live exactly. 15-20 was normal but 4? my CPU reaches 80+ on heavy loads yeat yours is 30 c which i believe is impossible for my pc to reach even at.


15-20 is normal for you? My rooms ambient temps are higher


eh i was just making a point.25-30 normal enough?
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May 6, 2013 9:28:34 AM

It's not a mobo or sensor problem, it's a software problem and has been discussed here numerous times. The sensor delivers a voltage and the software relates that to a temp value. the problem now is the offset and the non linear voltage curve. From my experience the mobo makers utility and the bios has the "best guess" what the real temps are.
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May 6, 2013 10:05:02 AM

^ Totally Concur.
3rd party software sometimes A) does not apply the correct offset, or B) looks at an incorrect address (location). Noidea_77 probably nailed it as incorrect offset as it changes when a load is applied.

Same meat, differanent potatoes - The sensors can be one of three devices 1) a PN junction, to a current device (RTD) or a resistive device. The output normally goes to a DAC that converts it to a HEXadecimal value and is stored in a registry (Address). The software then convers the value to a decimal and applies a algorthium to provide the reading (alternatly it could use a look up table).
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