CPU temperature shown in MB different from Asus Probe

[lu_151]

Just brought barton2600 with A7V600-X. overlclocked to 200*11.5
What puzzles me it that the CPU temperature shown in the motherboard BIOS is about 8-10 celsius higher than Asus probe. I tried MBM. The temperature was same as Probe's.
Anther question. My 2600 came with the heatsink. The thermal compound on it was like dried paste on the sink with a plastic case covering it. Was the compound dried out or it was the one that should be? I bought some thermal pad from CompUSA and they are like sticky gums. What should the thermal compound look like in thermal pad? Dry or sticky?

Thanks

[The Entropist]

when your in the bios the cpu is at full load so the temps read from there always seem a little high. as for the thermal compound, your heatsink probably came with a one time use thermal pad because none of the compounds ive used have dried like that. i think thermal pads are dry but the cpus heat sort of melts it on to the cpu. screw the pads and treat your chip to some arctic silver 5. its waaaay better

[lu_151]

Yes, my heatsink is from AMD and with a one time use thermal pad. A little curious: why CPU has to be at full load when in BIOS? BIOS is very small with only a few Megabytes.
I will try arctic silber 5 later. Is it electronically conductive?

[The Entropist]

i heard someone say that when in bios the cpu goes to full load somewhere on this site somewhere but that was awhile ago and i cant remember where. im pretty sure as5 isnt conductive cause my friend had it caked all over his xp palomino and it still worked fine

[AMDGUY]

AS5 is slightly conductive, so I'd be careful just in case. I've heard of some ppl having problems getting it on the chip & having problems.

[PhateX1337]

I have it caked on my xp 2100 pally and it is fine, no problems.

[wagnerl]

Originally Posted by lu_151

Just brought barton2600 with A7V600-X. overlclocked to 200*11.5
What puzzles me it that the CPU temperature shown in the motherboard BIOS is about 8-10 celsius higher than Asus probe. I tried MBM. The temperature was same as Probe's.
Anther question. My 2600 came with the heatsink. The thermal compound on it was like dried paste on the sink with a plastic case covering it. Was the compound dried out or it was the one that should be? I bought some thermal pad from CompUSA and they are like sticky gums. What should the thermal compound look like in thermal pad? Dry or sticky?

Thanks

This is a simple problem of lack of information.

The BIOS reads a sensor (simple silicon junction) inside of the cpu chip. It is instantly hot when you turn it on. In few seconds it reaches around 55C or more.

The ASUS Probe reads a sensor located at the motherboard, installed exactly under the CPU socket. It is very close to the CPU itself and it reflects the external CPU temperature.

One could say the external temperature sensor, the one read by ASUS Probe could reflects aproximately the heatsink temperature, and it is more steady and easy to understand. The CPU internal sensor can jump several degrees while processing and if used to inform the users, it could confuse them.

As a rule of thumb, think that the CPU internal temperature is about 10 to 15 C degrees above what ASUS tells you. The core temperature, the geometric center spot of the silicon chip temperature can be from 2.2 to 2.8 times the ASUS indication. The temperature of the ALU (aritmetic logic unit part of the chip) and the instruction decoding circuits can reach 3 or more times ASUS indication, it is a hell in there.