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post #1 of 13 (permalink) Old 07-17-2020, 05:05 PM - Thread Starter
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i7 3770k OC - critical temp?

Hi all,
I recently overclocked my i7 3770k to 4.2Ghz (1.16VCore) on my old MSI p67a c45 b3 motherboard. I use a Noctua nh-u12s cpu-fan.
I stresstested my system with Prime95 for 6 hours (large FFTs) and 1 hour (small FFTs). The maximum temperature (in CoreTemp) was 76°C (small FFTs option) and 68°C (large FFT´s option). Idle temperatures are at about 36°C.
Are the prime- temperatures too high for this CPU? I heard that the Ivy Bridge CPUs are not very heat resistant. Would it be useful to install a second cpu fan on the heatpipe to get lower temperatures?

Cheers Gilles
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post #2 of 13 (permalink) Old 07-17-2020, 05:12 PM
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post #3 of 13 (permalink) Old 07-17-2020, 05:29 PM
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That sounds perfectly normal.


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post #4 of 13 (permalink) Old 07-17-2020, 05:44 PM - Thread Starter
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What I don´t understand is why Intel says that the maximum "allowed" temperature for this CPU is 67°C but it obviously can reach 10°C more. Shouldn´t the CPU throttle down the voltage when it gets "too hot" or shut down windows?
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post #5 of 13 (permalink) Old 07-17-2020, 06:08 PM
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Quote: Originally Posted by gilles25 View Post
What I don´t understand is why Intel says that the maximum "allowed" temperature for this CPU is 67°C but it obviously can reach 10°C more. Shouldn´t the CPU throttle down the voltage when it gets "too hot" or shut down windows?
thats the Tcase temp; which is on the top IHS. core temps are quite fine +10c above that. mind you there are several temps sensors on chips: Tcase, core, package (top/middle/bottom) if not more..

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post #6 of 13 (permalink) Old 07-17-2020, 06:34 PM - Thread Starter
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Is the TCase temperature which is specified on the Intel product page (https://ark.intel.com/content/www/de...-3-90-ghz.html) the temperature which is shown in my BIOS? Or how can I measure the TCase temperature? Is there any general "guideline"-for the maximum core temperature of a CPU?
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post #7 of 13 (permalink) Old 07-17-2020, 07:24 PM
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don't worry about Tcase but yeah thats the one on the intel page. just get core temp, HWinfo, Aida . .ect and monitor the CORE temps. keeping those ~77c (or even up to ~82c but not buried) will be fine and best.

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post #8 of 13 (permalink) Old 07-17-2020, 08:11 PM
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Keep it out of the 90's and you should be fine. Delid it and you will probably be able to hit 4.5-4.7 without hitting temps or volts that are too high. I've had one that's done [email protected] for years. With an NH-D14 it peaks out in the low 70's with IBT max

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post #9 of 13 (permalink) Old 07-17-2020, 08:24 PM
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Quote: Originally Posted by gilles25 View Post
Is the TCase temperature which is specified on the Intel product page (https://ark.intel.com/content/www/de...-3-90-ghz.html) the temperature which is shown in my BIOS? Or how can I measure the TCase temperature? Is there any general "guideline"-for the maximum core temperature of a CPU?

As far as I know, there's no way to get the Tcase temperature. There's no sensor built into the CPU that measures it.

The CPU has sensors to measure the core temperatures. For the core temperatures, the limit for your 3770K is 105°C if I remember right. If you hit that temperature, the CPU will "throttle" and disable Turbo Boost and run at base clocks (3.5 GHz). Then next, if throttling doesn't help, if it hits 125°C it will shut down and crash the PC.

The way I understood things is, the Tcase temperature is a bit theoretical. Even if the cores are hitting their crazy high 105°C limit, the outside of the CPU will stay below that Tcase temperature limit. The sensors for the cores are in some spot that can get super hot, but the rest of the chip will always be colder.

I have a system with a 3570K here. In my experience, while using prime95 for testing your overclock settings, a good core temperature to target is 85°C. Things seemed to get strange after 85°C.

Another thing I remember from my 3570K system is: check for "WHEA-Logger" events in the Windows Event Viewer in the "Administrative Events" section. My 3570K can pass many hours of prime95 testing while later still randomly crashing (fully or just programs). The "WHEA" events are a good sign for that happening. Looking out for WHEA events was actually better for getting the system stable compared to using any test I could find.
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post #10 of 13 (permalink) Old 07-18-2020, 04:27 AM - Thread Starter
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I found seven WHEA- Logger Events with the Title "Fixed Hardware Error" from my CPU Core. But this was four days ago where my VCore Voltage was still set to 1.13V or 1.14V and prime crashed with these settings. I set the VCore Voltage to 1.16V yesterday and since then I didn´t get any WHEA-Logger Event happening. I will keep an Eye on my Event viewer the next few days.
Just for knowledge: What if the WHEA- Logger Events come back? Increasing VCore? (Sorry for my not so good english btw.)
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