CPU false temperature reading?

[cbs604]

Installed a new motherboard (ASUS A7V400-MX) and before closing it up, checked system and CPU temps. Found CPU idling at aroung 70C, although it didn't feel all that hot on the heatsink.

Turned it off overnight and then powered up and went straight to the BIOS temps. Room temp was 22, system was 22, and cpu was 36 which crept up to, and stabilised at 66 within a couple minutes.

Can the cpu temp possibly get from 22 to 36 in the 20 seconds it took to get to the temp display in the BIOS?

If not, can I safely assume the real idling temp is around 52 (66-(36-22))? And therefore can push the overtemp shutdown to the maximum?

BTW, where are the temp sensors? The cpu sensor is usually a little tab that presses up under the base of the cpu, but I cannot see one on this board.

Cheers,
Brodie

 

[electronicsfreak]

Check for bios updates sometimes motherboards give bad readings and they have updates to fix that. From looking up the board I see its athlon xp series. May I ask which athlon xp your using and also what core? Are you using the fan that came with the processor or are you using a seperate bought fan? If your using a seperate fan what make and model are you using? Also if your using thermal paste , dont , clean it up and use something such as thermal tape. Amd highly disreccomends using thermal paste. As for the sensor im not quite sure of but im sure the manual will tell you. Im not for sure about yours but my amd processor burns up around 80 something celcius. I figure yours is probally around there and if so 70 is a bit to high, running to close for comfort. There is also a link on amd if i can find I will post for checking to make sure your actual version of your processor is legit. Some sites sell overclocked processors as something elese. Example one site might be selling a amd athlon xp 2800 that is actually a 2600 overclocked. If I can find this site you will need the numbers on the top of your processor.

 

[electronicsfreak]

Here is the site I told you about. Get your processor numbers wrote down and be very careful when doing so then visit this site and verify your processor is what they said it is. This site also shows the voltage reccomendations and the cpu die temperature.

http://139.95.253.213/SRVS/CGI-BIN/...000000000231330235,K=7879,Sxi=1,Solution=3913

 

[cbs604]

Thanks, electronicfreak. It's not an XP, and I could not find a similar page for this cpu. But I did find an updated bios which I have downloaded and flashed.

I am using the cpu and fan that was on the old dead motherboard, in fact I replaced the fan as the old one was making a helluva racket. The HS is of a good size, but I don't know if it is the original AMD one or not - it's unmarked.

Unable to get any thermal tape, so stuck with using paste.

Here's the specs for the cpu:

CPU Properties:
CPU Type AMD Athlon-PECM, 1333 MHz (10 x 133)
CPU Alias Thunderbird
CPU Stepping A9
Instruction Set x86, MMX, 3DNow!
L1 Code Cache 64 KB
L1 Data Cache 64 KB
L2 Cache 256 KB (On-Die, Full-Speed)

CPU Physical Info:
Package Type 453 Pin PGA / 242 Contact Slot A Cartridge
Package Size 4.95 cm x 4.95 cm / 13.99 cm x 6.27 cm x 1.64 cm
Transistors 37 million
Process Technology 6Mi, 0.18 um, CMOS
Die Size 120 mm2
Core Voltage 1.75 V
I/O Voltage 1.6 V
Typical Power 34 - 65 W (depending on clock speed)
Maximum Power 38 - 72 W (depending on clock speed)

CPU Manufacturer:
Company Name Advanced Micro Devices, Inc.
Product Information

http://www.amd.com/us-en/Processors/ProductInformation/0,,30_118,00.html

CPU Utilization:
CPU #1 3 %



The BIOS is correctly reporting the cpu as AMD Athlon 1333MHz, 256K cache, and 133MHz FSB.

Still running (apparently) hot. I ran Burnin Test for an hour and the temp went up about 1 degree only.

I'm leaning now towards a false reading.

Cheers,
Brodie

 

[electronicsfreak]

First off I highly reccomend removing the paste. That alone should make it run cooler. It is possible your getting a false reading but I doubt it would be to high. Also I have the link below to your processor. According to it your die point is 95 celcius which is a relief. My advice take the thermal paste off run it for a while keeping an eye on the temp see if it lowers it. Im pretty sure that will help lower the temp. I know it did with mine. Amds site also says not to use it. Anyways try that and also if you dont have one get a case fan. Try that and reply back to me when you can if it made any difference and how much. Also any further questions and I will help to the best of my knowledge.

http://139.95.253.213/SRVS/CGI-BIN/...0000000000231346704,K=8372,Sxi=1,Solution=117

 

[micker377]

Am I reading something wrong here? "Remove the paste"? AMD says not to use it? Without paste, your CPU will self distruct in seconds. AMD doesn't have have the "throttle down" like the Intel CPU's. I can't believe ANYONE would advocate running without paste!

 

[electronicsfreak]

I am not using it on mine and if i can find it I will show you the link. By the way my processor runs at a steady 53 degrees. with the paste it runs at 57-59.

 

[electronicsfreak]

I cant find it right now if you want to use it go ahead but i read somewhere on there about processors not to use it maybe it was just on mine. And for the note im not trying to damage anyones processor. But the paste did make mine run hotter

 

[cbs604]

Because the bios reports 36C just 20 seconds from power up from an ambient temp of 22, I have to conclude the thing is just falsely reporting. So I pushed the shut-down temp to 75 (max) and run Burnin Test for an hour or so, but the temp only went up a degree or two. Assuming it's reading about 14 degrees high, that makes it to be running at about a very satisfactory 55.

Micker, electronicfreak was advocating using the amd phase change pad (why do they call it that??) instead of paste. I doubt he would be suggesting to use neither.

I have had to deliver the pc, so (fingers crossed) I hope it doesn't come back. If it does, I know exactly where to start looking.


Cheers,
Brodie

 

[mainegeek]

cbs604,
The cpu temp is going to increase quickly when you put power to it and then climb even higher depending on the work load. The key is to stabilize and maintain a descent cpu temp. Variables can include the type of cpu, a good quality and properly installed heatsink/fan as well as other factors. AMD doesn't say you can't use paste. What they say is that a pad should be used instead of paste because paste disipitates more quickly over time. I prefer paste on my own builds and I tend to use pads for other peoples.

You can watch their video on Thermal Pad or Paste.

http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_869_4348^6678,00.html