What's a safe delta to Tjunction temp?

[emblem]

At idle mine is around 44-45 and load it's around 38C.


Cpu is at 2.53ghz by the way.

 

[GarfieldtheCat]

That is fine.....I think a 30deg delta to Tjmax would be a good, safe max temp.

PS I think you got your idle/load temps backwards

 

[emblem]

actually no. I think I just worded it wrong.

at idle it's 43-45C till max remaining
at load it's 38C till max remaining.

 

[bryanW1995]

tjunction is the point at which thermal throttling is supposed to occur according to intel. As long as you aren't getting within 5-10c of this number under any circumstances, you are a-ok according to intel. Most of us here prefer to remain 20-30 below for everyday usage but that's not technically necessary.

 

[Foxery]

Also worth noting, the TJmax is different from Intel's recommended "safe" operating temperatures. For your E2200, this is 73C.

Source: http://processorfinder.intel.c...tails.aspx?sSpec=SLA8X

The chip will continue to run above 73C, but your level of risk rises sharply.

 

[Tempered81]

Originally posted by: GarfieldtheCat
I think a 30deg delta to Tjmax

i was going to say 30 or 25 Maximum


But i agree with this too, as I was taking mine to about 15C below at 88C on 105C tjmax in Coretemp:

Originally posted by: bryanW1995
As long as you aren't getting within 5-10c of this number

 

[Tempered81]

Originally posted by: Foxery
Also worth noting, the TJmax is different from Intel's recommended "safe" operating temperatures. For your E2200, this is 73C.

Source: http://processorfinder.intel.c...tails.aspx?sSpec=SLA8X

Thermal Spec is Tcase measurement with some gradient AFAIK. so the 73.3C is Tcase and not Tjunction. But if little to no gradient exists, then they are the same i guess.

Either way this remains true:

Originally posted by: Foxery
The chip will continue to run above 73.3C, but your level of risk rises sharply.

Who primes for more than 24hrs though? this is where extreme OC pcs and folding pcs seperate... The folding machine will run with full load temps for days at a time requiring it not to surpass approx ~73.3C, while the gaming pc will only run full cpu load for intermittent bursts allowing higher oc's and potential load temps....

 

[emblem]

I guess I'll go ahead and try to OC higher.

 

[imported_ST]

Originally posted by: Foxery
Also worth noting, the TJmax is different from Intel's recommended "safe" operating temperatures. For your E2200, this is 73C.

Source: http://processorfinder.intel.c...tails.aspx?sSpec=SLA8X

The chip will continue to run above 73C, but your level of risk rises sharply.

Thanks for the link....but I am a little confused now....everyone always quotes via Tjmax (delta to, etc.), but it looks like the standard to which we should look at is Tcasemax ie Thermal Specification...no?

For example, yes my TJMAx on my Q9450 is 95W, but Tcase is 71.3C. I was not as concerned with my 66C full load temps before, until the link you posted above on TCase.

 

[Accord99]

Originally posted by: ST
For example, yes my TJMAx on my Q9450 is 95W, but Tcase is 71.3C. I was not as concerned with my 66C full load temps before, until the link you posted above on TCase.

The Tcase temperature reading and the Tjunction reading are from different locations.

 

[Foxery]

Originally posted by: ST
Thanks for the link....but I am a little confused now....everyone always quotes via Tjmax (delta to, etc.), but it looks like the standard to which we should look at is Tcasemax ie Thermal Specification...no?

For example, yes my TJMAx on my Q9450 is 95W, but Tcase is 71.3C. I was not as concerned with my 66C full load temps before, until the link you posted above on TCase.

66C is a pretty normal (load) temperature for current generation CPUs. You're fine.

The way I understand it, 73C is the hottest that Intel guarantees "error-free operation." The TJmax is then the point at which the chip is in danger of becoming damaged, and is supposed to shut itself down to prevent it.

The figure of 95 Watts refers to the amount of heat coming out of the die; i.e. putting a finger on the chip would burn you the way touching a 100 Watt light bulb does

 

[imported_ST]

Originally posted by: Accord99

Originally posted by: ST
For example, yes my TJMAx on my Q9450 is 95W, but Tcase is 71.3C. I was not as concerned with my 66C full load temps before, until the link you posted above on TCase.

The Tcase temperature reading and the Tjunction reading are from different locations.

I'm well aware of the differences between the industry acceptance of Tcase vs. Tj, however this statement from Intel is a bit confusing:

"Thermal Specification: The thermal specification shown is the maximum case temperature at the maximum Thermal Design Power (TDP) value for that processor. It is measured at the geometric center on the topside of the processor integrated heat spreader. For processors without integrated heat spreaders such as mobile processors, the thermal specification is referred to as the junction temperature (Tj). The maximum junction temperature is defined by an activation of the processor Intel® Thermal Monitor. The Intel Thermal Monitor?s automatic mode is used to indicate that the maximum TJ has been reached. "

Thus for my Q9450, my specs:

Thermal Design Power: 95W
Thermal Specification: 71.3°C

So what is the 71.3C rating? And where is this measured then, as apparently RealTemp, CoreTemp, and others don't use this...

 

[bryanW1995]

TjMax is measured at the diode on each individual core. These are obviously going to be much hotter than the "geometric center" of the ihs, as (hopefully) a lot of the heat is going to be wicked away by the hsf/waterblock before getting there. Basically, I would read the tcase of 71.3 as being roughly equivalent to the tjmax temp of each core (which is "probably" 95c on a Q9450).

edit: nobody uses tcase the actual core temp is more important. if your cores are running at 102c on the 9450 but your tcase is 68.8 b/c you have great cooling, you're probably going to cause irreparable harm. If your cores are at 82c and your tcase is 73c, you're probably still ok, at least for short term work like stability testing.