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Wrong Tj. Max for Intel Xeon 45nm processors

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Wrong Tj. Max for Intel Xeon 45nm processors

Postby Floyd » Sun Jun 11, 2017 3:37 pm

Hello, I know it can be solved with the "Adjust offsets" option but it would be great if the program detects this family correctly. These CPUs are very popular because they can be used in old socket 775 motherboards.

Comparison with AIDA64:
tjmax.png
tjmax.png (55.72 KiB) Viewed 1440 times


Intel doc (page 19):
Intel® Xeon® Processors 5400 Quad-Core:
X5492, X5482, X5472, X5470, X5460, X5450 85 °C


Thanks for this awesome software!
Floyd
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Re: Wrong Tj. Max for Intel Xeon 45nm processors

Postby The Coolest » Tue Jun 13, 2017 5:11 pm

I'm aware of this doc. It was a really long discussion and eventually I decided to keep TjMax at 100 for some models.
In some cases it will work and in others it may not. I suggest to simply apply the offset in your processors case.
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Core Temp - Accurate temperature monitor for Intel's Core/Core 2 and AMD64 processors
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Re: Wrong Tj. Max for Intel Xeon 45nm processors

Postby Floyd » Tue Jun 13, 2017 5:42 pm

The Coolest wrote:I'm aware of this doc. It was a really long discussion and eventually I decided to keep TjMax at 100 for some models.
In some cases it will work and in others it may not. I suggest to simply apply the offset in your processors case.


That's ok, I respect your decision but I can confirm that the CPU throttles when it reaches 85ºC so that document is correct, at least with X54XX processors.

But, it would be great if you reflect the offset correction here:

tjmax_offset.png
tjmax_offset.png (72.46 KiB) Viewed 1404 times


I mean, if I set -15 (as I do) that box should say 85ºC instead of 100ºC. I'm asking for this because I browse several OC forums where members use your program and you can't never guess if a particular member adjusted the offset (watching their screenshots) or he simply has a bad cooling system. It's not a problem if the member uses AIDA64 or Speedfan because they detect the Tj. Max well, but most of them use Core Temp or RealTemp. In this last case it's easy to guess because it shows distance to Tj. Max below the temps.

Thanks!
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Re: Wrong Tj. Max for Intel Xeon 45nm processors

Postby The Coolest » Tue Jun 13, 2017 7:17 pm

There is no way to 'detect' TjMax on Core 2 generation processors.
All these programs have an internal 'database' which they use for this.
The TjMax value was added into a separate register only with the introduction of the Nehalem architecture.

There are some technical aspects due to which making the change you request is probably more work than it's worth in practice.
I can understand why an owner of such a CPU would want it, but if you think about it, it's a 10 year old processor, which isn't that widespread anymore.
Member of our O/C Folding @ Home team
"<The_Coolest> you can't unwaste wasted CPU cycles" - Start FOLDing now!
Main rig:
Core i7 2600K 3.4GHz @ 4.5GHz (Scythe Mugen2) / Mobo: Biostar TP67XE / SSD: Crucial M4 128GB (+ HDDs) / GPU: HD5450 / Mem: 4x4GB DDR3-1600 G.Skill 4GBXL RipJaws X - 16GB total / PSU: Seasonic S12II 620W.
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Core i3 540 3.06GHz @ Stock / Mobo: MSI H55M-ED55 / GPU: Integrated / Mem: 2x2GB DDR3-1600 G.Skill 4GBRL RipJaws - 4GB total / PSU: FSP ATX350-PNR 350W.

Core Temp - Accurate temperature monitor for Intel's Core/Core 2 and AMD64 processors
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Re: Wrong Tj. Max for Intel Xeon 45nm processors

Postby Floyd » Tue Jun 13, 2017 7:51 pm

The Coolest wrote:I can understand why an owner of such a CPU would want it, but if you think about it, it's a 10 year old processor, which isn't that widespread anymore.


Are you sure? :mrgreen:

xeon775.png
xeon775.png (64.78 KiB) Viewed 1402 times


1212 pages, 1,538,148 views, last post today: http://www.overclock.net/f/5/intel-cpus

As an overclocker, you surely know that overclocking an Intel "k" processor is pretty easy and boring. It's "overclocking for the masses". Even today, overclocking enthusiasts are buying high performance 775 motherboards in order to play with these CPUs (my EP45-UD3P is still sold for more than $100-120 in ebay because of this).

Overclocking one of these processors above 4.5 GHz and let it stable is a challenge even for experienced overclockers. That's why, in 2017, we're still playing with these beauties. All OC forums have an active thread with this matter.

Kind regards.
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