Time it takes to reach CPU's optimum temp?

davedudes · 19 Oct 2011 at 17:36

Just curious to know how long it takes for a cpu to reach its optimal temperature, were it hits a wall. Heard it was an hour or so, can any of you guy's spread some light onto the subject?

Cheers guys.

davedudes · 19 Oct 2011 at 18:42

No views?

God I hate bumping my own thread's

Admetos · 19 Oct 2011 at 18:46

I would say it's minutes. The reason I say that is I hibernate, and in the past had speedfan running (so speedfan on the displaying as windows loads), the core temps raise very quick indeed.

Surveyor · 19 Oct 2011 at 18:46

I don't really understand your question.

Do you mean maximum temperature?

davedudes · 19 Oct 2011 at 18:54

Surveyor said:
I don't really understand your question.

Do you mean maximum temperature?

Idle or load. Say from when you first startup your pc, how long does it take to reach its max temp at idle?

Jokester · 19 Oct 2011 at 18:56

Depends entirely on what's cooling it, my water cooling takes about 2hours to reach thermal equilibrium at 100% load, but with a stock cooler it could be a matter of a couple of minutes.

panyan · 19 Oct 2011 at 18:57

surely the optimum temp is as low as you can get it, thus the need for water and even LN2 cooling, etc

in regards to the time taken to get to that temp? surely if we want the CPU as cold as possible the optimum time is zero i.e. the coldest it will be -> optimum

:confused:

weird_dave · 20 Oct 2011 at 00:23

I would suggest the optimum of 0 Kelvin is impossible to achieve

SupermotoMX · 20 Oct 2011 at 00:57

from startup, my cpu is about 12c once it reaches windows (cold house

) and takes about 20 mins of doing nothing to reach the 15 - 18c idle temp)

but doing youtube / skype its usually about 19 - 22c, max ive seen at it since i replced the cpu cooler is 29c i would say my cpu cooler is overkill considering all fans are on 800rpm push/pull (it doesnt even get hot enough to ramp them up to they're full 1800 haha)

Surveyor · 20 Oct 2011 at 01:00

weird_dave said:
I would suggest the optimum of 0 Kelvin is impossible to achieve

Would 0°K be the optimum temperature even if it could be reached?

At that temperature elements at the atomic level slow down and conductivity increases immensely leading to superconductivity.

Even if you could cool to that temperature things such as the packaging of the CPU, the thermal paste, plastics, etc. would become conductive thus shorting everything out.

Surveyor · 20 Oct 2011 at 01:03

SupermotoMX said:
from startup, my cpu is about 12c once it reaches windows (cold house ) and takes about 20 mins of doing nothing to reach the 15 - 18c idle temp)

but doing youtube / skype its usually about 19 - 22c, max ive seen at it since i replced the cpu cooler is 29c i would say my cpu cooler is overkill considering all fans are on 800rpm push/pull (it doesnt even get hot enough to ramp them up to they're full 1800 haha)

It would have to be a very cold house.

For 15-18°C idle temperatures I would say the ambient temperature would have to be in single digits °C.

weird_dave · 20 Oct 2011 at 01:19

Surveyor said:
Would 0°K be the optimum temperature even if it could be reached?

At that temperature elements at the atomic level slow down and conductivity increases immensely leading to superconductivity.

Even if you could cool to that temperature things such as the packaging of the CPU, the thermal paste, plastics, etc. would become conductive thus shorting everything out.

That's a good point. Google is mildly suggesting a few K has been achieved with some electronics but links to decent sources aren't leaping out at me.

Rroff · 20 Oct 2011 at 01:27

Surveyor said:
It would have to be a very cold house.

For 15-18°C idle temperatures I would say the ambient temperature would have to be in single digits °C.

Can't remember the exact details off the top of my head but the way CPU temp is measured with deltas, etc. and the nature of the sensor means its not very accurate on most CPUs sub 20C in most cases.

SupermotoMX · 20 Oct 2011 at 01:30

Surveyor said:
It would have to be a very cold house.

For 15-18°C idle temperatures I would say the ambient temperature would have to be in single digits °C.

currently 17c with a h50 and overclocked 240, and yes, it is a cold house

the 11c was from thismorning as i stupidly left my bedroom window open.

just thinking.. a h50 cant freeze can it? :O

Rroff · 20 Oct 2011 at 01:30

SupermotoMX said:
just thinking.. a h50 cant freeze can it? :O

Aslong as the pump keeps going it won't freeze except under extreme conditions - not sure what the low end operating temp on the pump would be.

Surveyor · 20 Oct 2011 at 01:44

SupermotoMX said:
currently 17c with a h50 and overclocked 240, and yes, it is a cold house

the 11c was from thismorning as i stupidly left my bedroom window open.

just thinking.. a h50 cant freeze can it? :O

I think you need to take those temperatures with a pinch of salt.

Firstly the Athlon II doesn't have temperature sensors on each core it only has a single thermal sensor. There is no way of getting a per-core reading on those processors.

Secondly I believe AMD's digital sensor doesn't report an absolute temperature value but a reading with a certain offset, which is unknown. It is estimated that this offset is between 10 - 15c. Any temperature reading you get is only a guesstimate of the actual temperature.

Using CoreTemp may give you a better idea of the CPU temperature.