13*C Difference in cores?

I just slapped my new T9500 into my laptop a few days ago, and today I noticed something weird: There's a 13 degree difference in the cores. It's undervolted now, but even at default voltage, the hot core doesn't go over 65 when running orthos.

I can't think of how I could have installed the heatsink wrong, and I got AS5 even over the whole. Basically I just wanna know if anyone has seen a natural difference this high? The difference seems to stay uniform to 13 whether it's in idle or under load. Installing the CPU was a 7 hour job, so I really really don't want to take it apart again.

 

7 Hours !!

Well, I don't think it is a heat-sink seating problem since your load temps are fine, but you can reseat it if you want to. The chip has a single die, so if its covered, that's fine. Something must be screwed up in the DTS. Try stress-testing it for a couple of 12 hours (Small-FFTs), to see if it has any errors. And try different software, such as Realtemp, Coretemp, etc.

The core that has the temp equal to the ACPI THRM, that should be the correct temp of both the cores. Usually core-temps differ by about 5*C max, ideally 1-2*C.

 

sound fine.

I have a ~10C degree difference between cores.

We went over this already... about the temp sensors are not exactly in the same spots for the cores, which would explain the difference.

 

Ya, replacing the CPU in an HDX requires removal of the system board, as the CPU is on the bottom of the board. It was a really nerve racking job.

It is completely stable, I tested it over night right after I put it in, so no errors.

Well that's good to know, I do remember reading through some of that stuff, but I didn't remember it being that high.

 

13 degree difference is not something to worry about, but a uniform difference of 13 degrees is not normal either. For how long did you monitor the temperature ? Check it for a couple of days over several reboots. And if you still notice a 10~20C constant difference then perhaps something is going on... Maybe the processor is not identified properly. Run few applications and look at the CPU usage graph of task manager under performance tab. See how the load is balanced between the cores.

 

Just the location of the sensors warrants a fairly significant difference, but the difference should be lower on idle and more so during load. 13 degrees is fine.

 

Would you like me to raise the second core 13°C?

 

If it's all stable and so, there shouldn't be anything to worry about at all. A high difference can mean one of the DTS can be bad, but it's nothing to worry about.

 

I reapplied the paste on my pavilion the other day aswell, such a pain to change cpu's on HP notebooks.

As for the inconsistent temps, i wouldnt worry about it unless its overheating.

 

I will give it another good orthos run tonight while I'm sleeping and log the temps. Both Everest and Coretemp are giving me 33/46 at idle right now.

 

Run Small FFT's on ORTHOS. Try using hwmonitor aswell.

 

You probably got a CPU with a fairly bad factory calibration. Sensors don't have much to do with this, since the sensors are on each core, not on the side of the cores. If it was due to the sensors, then 90% of the chips would have had huge differences of ~10*C for each core.

The chip was probably not calibrated properly, or one of the thermal diodes or DTS is faulty, which is resulting in a screwed up Tj. If the CPU is not overheating, then you really don't need to worry about it.