Overclock.net › Forums › Intel › Intel CPUs › Real maximum temperature for Intel processors
New Posts  All Forums:Forum Nav:

Real maximum temperature for Intel processors

post #1 of 8
Thread Starter 
Is Tcase maximum temperature allowed by Intel? I mean I have seen cases when CPU was running way hotter than the maximum allowed and was fine in long term use. What is real Intel chips MAX temperature per generation? Any way to calculate it/obtain it ?
post #2 of 8
You can get the info straight from Intel, for example a 3930k lists the T case at 66.8°C half way down their data page:

http://ark.intel.com/products/63697

I think Intel provides this info for pretty much all of their processors.

Whether an individual chip will go higher than this and to what degree is still a lottery like the process of overclocking itself. Intels stated is the guaranteed minimum to fall within spec, some will go higher, maybe some won't. Much like finding a good overclocker at low volts.
Meh
(11 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k @4.7GHz Asus P8Z68-V GEN3 GTX Titan 16GB Mushkin Redline Ridgeback 
Hard DriveHard DriveCoolingOS
Crucial M4 128GB  2x 500GB WD Green RAID1 + WD 2TB Green  Noctua Nh-DH 14 Win 8 Pro x64 
MonitorPowerCase
Shimian Achieva 2560x1440p IPS Corsair AX850 Lian-Li PC-A05N 
  hide details  
Reply
Meh
(11 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k @4.7GHz Asus P8Z68-V GEN3 GTX Titan 16GB Mushkin Redline Ridgeback 
Hard DriveHard DriveCoolingOS
Crucial M4 128GB  2x 500GB WD Green RAID1 + WD 2TB Green  Noctua Nh-DH 14 Win 8 Pro x64 
MonitorPowerCase
Shimian Achieva 2560x1440p IPS Corsair AX850 Lian-Li PC-A05N 
  hide details  
Reply
post #3 of 8
Thread Starter 
Tcase:

"TCASE Max is the maximum temperature that the TCASE sensor should reach. Both TCASE and the thermal specification information can be found on the Intel web site.

Tjunction Max is the maximum temperature the cores can reach before thermal throttling is activated. Thermal throttling happens when the processor exceeds the maximum temperature. The processor shuts itself off in order to prevent permanent damage."

However they are able to work above that temperature. That is what I am wondering about. For an example I found that for older Core 2 Duos Tcase is 105 degrees
post #4 of 8
If I recall correctly, however, Tcase is the maximum temp that they recommend at the IHS. Obviously, temps on the cores would be much higher than this.
post #5 of 8
Thread Starter 
Tcase - IHS temperature
Tjunction - Cores

105 degrees is for mobile processors for up to 35W consumption
post #6 of 8
Most people don't understand that there is no software available to accurately measure the TCase temperature. This specification has always been intended to be used by system builders that are building computers by the thousands.

To accurately measure TCase you need to cut a groove into the heat spreader on top of your CPU. You then have to mount a calibrated thermocouple to the geometric center and solder this into place. Grind it down so it is flush and now you are ready to measure the TCase temperature of your CPU.

Intel does not want individual users hacking up their new CPUs with the Dremel or taking their CPUs to the machine shop for this procedure. For end users they decided to mount temperature sensors at the hottest spots on the core. ie. these are known as core temperature sensors. These sensors are built into the CPU and the information they report has nothing to do with the TCase specification.

As the cores heat up, these sensors will count down to zero. When a core reaches zero, this will trigger thermal throttling, your CPU will then slow down and reduce the core voltage to prevent it from being damaged. As long as your Intel CPU is not thermal throttling, it is running with in the Intel design spec. If Intel thought this was going to hurt your CPU it would be simple for them to lower the thermal throttling temperature.

You can run RealTemp and look at the Distance to TJ Max data. These are direct readings of your core temperature sensors. If it shows a number bigger than zero and and the Thermal Status area shows OK, your CPU is running within spec and there is no need to worry about its temperature.

Thermal throttling and thermal shut down are controlled by core temperature data. TCase is a useful spec for system builders that are engineering heatsinks and deciding what size and speed they should use when choosing a case and some fans.

Edit: TCase is definitely not 105C for any CPU. The 45nm Core 2 Duo CPUs had a maximum core temperature of 105C.

Here's an example of a CPU that is very hot but it is still running at full speed because it is within the Intel thermal spec.

http://img27.imageshack.us/img27/6216/torturetest.png
Edited by unclewebb - 10/18/13 at 5:16pm
post #7 of 8
Also, to add to that last post, I suppose it might happen that the sensors reach zero and the CPU throttles, but this still does not help with the temperatures. The CPU will still go on and work, but on throttled speed. This still produces some reduced amount of heat. There is another value where it actually shuts off for protection. I only know that's 125C on my 3570k CPU, while TJ max and throttling is at 105C.
post #8 of 8
va3k.png

There are 2 signals that go active in an Intel CPU when it gets hot. PROCHOT goes active when the CPU reaches its maximum safe operating temperature. That's when RealTemp will report 0 for Distance to TJ Max. When your CPU gets approximately 25C hotter, the THERMTRIP signal will go active and this results in an almost immediate shutdown of your CPU and obviously your computer. These signals are based on the core temperature data. The TCase temperature has nothing to do with the operation of an Intel CPU.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Intel CPUs
Overclock.net › Forums › Intel › Intel CPUs › Real maximum temperature for Intel processors