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Please help with strange temp sensor readings on Gigabyte MA78G-DS3H

K

kantona

Junior Member
Hi all.

I have recently assembled my home PC (after owning a laptop for few years so I am a bit out of touch) with a Gigabyte MA78G-DS3H motherboard. My question is for the temp sensors information but in case it matters, the CPU is Athlon x2 4850e, the memory matched pair of Corsair 2x1GB PC6400, using the onboard graphics for the moment, 250GB Seagate SATA2 drive and LG SATA DVD-RW. 400W Fortron PSU.

In the BIOS (version F3) Health page, two temperatures are displayed, the CPU and system temp. They both range in 38-42 degrees which I think is normal.

However, using for example Speedfan 4.35 to be able to follow the temp without going to BIOS is confusing me a little. Speedfan shows three temps, naming them Temp1, Temp2 and Temp3. While Temp1 and Temp3 are in 38-42 range so I am connecting them to the CPU and system temp, the level of Temp2 is shown as 90-92 always. Right from boot and does not change much later after computer has been working for hours. Should I be worried about this? Is it just sensor mismatch/misreading?

The case had one fan mounted on the back blowing air outside and this air does not seem too hot as per my expectations. You can comfortably hold your hand in the airflow. Further more, if there is any component inside the case radiating 90 degrees, wouldn't the system temp be much higher than 41-42?

So, is there a component hot at 90 degrees or not? Should I be worried?

I hope someone can give me some advice about this matter and whether I should do something about it.

Oh, in case it matters, the PC was assembled a week ago and has been working for approx 12-14 hours a day, every day, and nothing is dead from overheating yet. 🙂

Thanks in advance. Cheers.
 
Thanks.

Their website says it's for Intel CPU, I have AMD. Should I use it anyway?

And I was looking more for a program that will show my system temp too. This looks like CPU only. But I will give it a shot if it can work with AMD.
 
Thank you. I downloaded CoreTemp and will install it.

By system temp I was just using the same terminology as the BIOS info, it shows CPU and system temp. My logic is that it's probably a sensor measuring air temp inside the case, that's how I understand it anyway.

My main concern was actually an additonal, third temperature reading shown in Speedfan, with value 90-92 degrees. It got me worried because first of all no silicon chip would stand that (in fact any silicon chip on 90 should be already dead I believe). So I am not sure whether it is just "wrong" reading/info from Speedfan, or there is something on the MB which actually works on 90 degrees?

Maybe the NB? Should it be that high? (graphics integrated in it)

The NB, AMD 780G, has a decent heatsink stuck on it but no fan (and no holes to mount a fan). I expect Gigabyte to do their job in design, even if the NB is at 90 degrees, it should probably take it.

On other forum I found a post about someone being worried with this 90 reading too and he actually touched the NB heatsink with case opened. He said while the heatsink is hot, it doesn't seem like 90 degrees hot. And another post said that using a termal probe showed that the NB heatsink is far lower than 90. So there was still confusion where this 90 degrees reading would come from and whether it is true at all. But most people agreed that it's not a CPU temp which is my opinion too.

While on the NB heatsink story, someone also said that they attached 40mmx40mm fan on it simply with wire (no holes to mount one properly). Would that be recommended?
 
I would assume it's the North bridge temperature. The easier way to test that would be stick a fan by it and see if the temp goes down. A 40x40 or 50x50mm fan would work for that. You could probably use zip-ties instead of wire. I suppose it would just depend on where the sensors are and what the readings are. I think there's a way to look up what it is assigned to in speedfan though.

Also another alternative to speedfan would be Everest (but it's not free it also does alot more; benchmarking, pc info, temps, etc.).

Also, this is one of the things you sacrifice when using passive cooling; temp's are higher.
 
Thank you for all your help. Now I am very angry with myself that I didn't do more detailed research of the board etc. The last time I was assembling a PC heat and cooling were not big issues. 🙂

Lookng at the mobo pic now (quicker than opening the case), I can clearly see the 2 holders/pushpins holding the NB factory installed heatsink. If I had paid attention to this I would have been ready with better NB cooler during installation. At this point of time, I wonder if disassembling my PC is worth it just to replace the NB heatsink.

On top of that, I didn't pay attention while installing the CPU cooler and the locking lever is on the bottom side, on the NB heatsink side. It might even interfere with another type of heatsink/NB cooler.

I don't plan to overclock or similar but I will use the onboard graphics and I really don't know if removing everything to install another NB cooler is worth it. 🙁

Also, with regard to passive cooling, would a ZM-NB32K for example help as compared to the factory heatsink? Help enough for the mobo removal to be justified? Or I should look strictly at active cooler, with a fan?

Thanks for any advice.
 
OK, I solved it. In fact, as I hoped, I had no problem at all. 🙂

Although both Speedfan 4.35 and HWMonitor 1.10 show some strange 90 degrees temp reading it seems this is just mismatch between the programs and the sensor chip.

At first I was worried that my NB, AMD 780G, is really developing 90 degrees but after opening the side of the case and touching the NB factory installed heatsink, I realised it is no where near 90 degrees. The PC was already wrking for hours so full operating temp should have been reached.

The NB heatsink is barely slightly warmer than my finger. I was able to hold my finger on it indefinately, basically. I would assume only few degrees above body temp, meaning high 30-ies.

If the NB is really on 90 degrees the heatsink would be at least 70 (even more than that) and there is no way you could touch it longer than 4-5 seconds.

So in my case I think Speedfan and HWMonitor readings of temp close to 90-92 degrees are simply wrong.

Cheers.
 
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