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How hot should an i-5 3570k run?

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July 23, 2013 1:17:47 PM

I had it over locked at 4.1ghz and it was idling at around 46-50 and under full load the hottest it got was 67. It is water cooled by a single rad. Is this too hot? Should I turn it back down to 3.8 ghz?

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July 23, 2013 1:22:28 PM

67 is an ok temperature for load, do you live in a hot climate?

if you live in a cooler climate then i would try getting it lower.

you could try re applying thermal paste using the rice grain in the middle method and let it spread itself to try to get cooler temperatures, it make a far more even coating than spreading it yourself and prevent air bubbles.
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July 23, 2013 1:24:54 PM

If you max at 67C you're okay. However, with a water cooler you really shouldn't be getting that hot. Is this a custom loop or is it a pre-made unit from Antec or Corsair for example?

I run an i5-750 @ 4GHz on an Antec Kuhlor and never get that hot. No A/C here in the summer either.
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July 23, 2013 1:27:33 PM

I have an H80 and the 3770 at 4.1 and this is about what my temps are. dont worry at all the chips can handle 90s so 67 is not even pushing it.

Thent
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July 23, 2013 1:31:51 PM

thently said:
I have an H80 and the 3770 at 4.1 and this is about what my temps are. dont worry at all the chips can handle 90s so 67 is not even pushing it.

Thent


Now, an GPU might be safe up to a max of 94C for example but I'd never allow a CPU to get that hot.
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July 23, 2013 1:37:09 PM

Here we go again!

What is your Ambient temperature?
Define "full load" - Prime95 Small FFT's?
Which temperature monitoring utility are you using?
What liquid cooling system are you running?

Intel's Thermal Specification - http://ark.intel.com/products/65520/Intel-Core-i5-3570K... - for your i5 3570K is 67C, however, the technical definition of their specification is very complicated, so I'll break it down for you.

There are 5 thermal sensors in a 4 core processor; a single Analog sensor (CPU temperature) and 4 individual Digital sensors (Core temperatures).

The temperature shown in Intel's specification, (Tcase), is measured on the surface of the Integrated Heat Spreader (IHS) under tightly controlled laboratory conditions at 22C Standard Ambient (intake temperature). For lab testing only, a groove is cut into the surface of the IHS where a thermocouple is embedded at the center. The stock cooler is attached, and a steady-state 100% workload is applied, (such as Prime95 Small FFT's). Thermal saturation is reached within 10 minutes.

Since there is no thermocouple on any processors outside Intel's labs in the wholesale or retail outlets, a single Analog Thermal Diode is instead used to "emulate" a thermocouple. This single analog sensor is located in the center of the lower layers of the processor package and is called "CPU" temperature, which is the equivalent of "Tcase".

The analog value is converted to digital (A to D) by the Super I/O (Input / Output) chip on the motherboard, then is calibrated to look-up tables coded into BIOS, which are all too often inaccurate. This is the temperature you see in BIOS and in monitoring utilities such as AI suite II, which are provided by motherboard manufacturers.

"Core" temperature, also called "Tjunction", is measured at the heat source by an individual Digital Thermal Sensor (DTS) for each Core, which are factory calibrated. Since the CPU sensor is not in relatively close proximity to the heat source, there is ~5C thermal gradient or "offset" between "Core" temperature and "CPU" temperature during Prime95 Small FFT's.

This means that Intel's "CPU" temperature (Tcase specification) runs ~5C less than "Core" temperatures. More correctly, since there is always some temperature sensor discrepancies between Cores, "average" Core temperature is most important. So if Prime95 Small FFT's is run for 10 minutes at 22C Ambient, then the average Core temperature is ~72C.

Standard Ambient = 22C
Tcase (CPU Temp) = 67C
CPU / Core Offset + 5C
Tjunction (Core Temp) = 72C
Tj Max (Shutdown Temp) = 105C

Tj Max is Intel's Thermal Specification which defines the "Core" temperature at which the processor will shutdown. Excessive heat kills electronics. Most folks in the overclocking community will agree that any sustained temperatures greater than 75'ish are just too hot for a 12 hour stability test or for processor longevity.

Bottom line? Your Core temperatures are within Intel's specs. You're OK up to 75'ish, but remember that when running Prime95 Small FFT's, if you're testing below or above 22C Standard Ambient, then you need to add or subtract the difference so that your test results are corrected to Intel's standards. This way you eliminate variables, and your results will always be consistent and repeatable.

Some additional thoughts to keep in mind - Thermal Testing:

Prime95 Small FFT's is the standard for processor thermal testing, because it's a steady-state 100% workload. This is the test that Real Temp uses to test sensor movement. Prime95's default test, Blend, is a cyclic workload for testing memory stability, and is not suitable for thermal testing. Other tests such as IBT (Intel Burn Test) have segments which flood all registers with all one's, which is the equivalent of a 110% workload. While suitable for stability testing, IBT is uncharacteristic of real-world maximum loads. You can see for yourself by using the "Graphs" in SpeedFan to illustrate and compare how these tests create different thermal behaviors. On air cooling, thermal saturation is typically reached within 10 minutes, however on liquid cooling, saturation may require up to 30 minutes.

I hope this answers any questions you may have about processor temperatures.

Comp :sol: 
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July 23, 2013 1:38:05 PM

I agree for sure but Tmax (Temp intel says it will die at) is 105 so I agree high 70s is most anyone should ever see but is not harmfull per se..
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July 23, 2013 1:41:33 PM

CompuTronix said:
Most folks in the overclocking community will agree that any sustained temperatures greater than 75'ish are just too hot for a 12 hour stability test or for processor longevity.


^ This
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July 23, 2013 1:51:10 PM

jerreece said:
If you max at 67C you're okay. However, with a water cooler you really shouldn't be getting that hot. Is this a custom loop or is it a pre-made unit from Antec or Corsair for example?

I run an i5-750 @ 4GHz on an Antec Kuhlor and never get that hot. No A/C here in the summer either.


It's an antec kuhler 620.
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July 23, 2013 1:55:00 PM

xXNOAH69Xx said:
jerreece said:
If you max at 67C you're okay. However, with a water cooler you really shouldn't be getting that hot. Is this a custom loop or is it a pre-made unit from Antec or Corsair for example?

I run an i5-750 @ 4GHz on an Antec Kuhlor and never get that hot. No A/C here in the summer either.


It's an antec kuhler 620.


Same cooler I'm using on my i5-750. My room temps range from 72-78F (not A/C control). That being said, my CPU OC'd to 4Ghz usually hits the 46-50C range while I'm playing games. Your CPU may well put out more heat than mine. Room temps can be different, air flow through case, etc. You might also blow out the cooling fins and the fans on the Kuhler 620. I just did that with mine recently as it's been getting hot. Shaved a couple degrees off my temps (wasn't filthy dirty though).

EDIT: Oh yeah, I'm also using a Push/Pull fan setup. Two fans on the radiator. One blows into it from within the case, the other blows away out the back of the case.
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July 23, 2013 1:56:43 PM

Another thing. I don't know if it would put more stress on the CPU but I run 2 monitors. 1 playing the game and the other monitoring all my stuff
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July 23, 2013 1:57:36 PM

xXNOAH69Xx said:
Another thing. I don't know if it would put more stress on the CPU but I run 2 monitors. 1 playing the game and the other monitoring all my stuff


Nah, that's more a GPU task then a CPU thing. I run two monitors too so I can monitor CPU/GPU temps. :) 
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July 23, 2013 1:57:50 PM

Once again:

What is your Ambient temperature?
Define "full load" - Prime95 Small FFT's?
Which temperature monitoring utility are you using?
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July 23, 2013 1:58:32 PM

CompuTronix said:
Once again:

What is your Ambient temperature?
Define "full load" - Prime95 Small FFT's?
Which temperature monitoring utility are you using?


Core temp


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July 23, 2013 2:01:28 PM

What is your Ambient temperature???
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July 23, 2013 5:30:05 PM

"Ambient" temperature means "room" temperature, preferrably measured near your computer, which is "intake" temperature.
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July 23, 2013 6:21:00 PM

CompuTronix said:
"Ambient" temperature means "room" temperature, preferrably measured near your computer, which is "intake" temperature.


Well at the moment my AC is broken and on hot days it probably get to around 80 Fahrenheit and my pc is on the floor so the hottest is probably mid 80's. in prime95 the hottest it got was 73 Celsius.
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July 23, 2013 8:29:50 PM

In order to best help you, we sometimes ask certain questions, and when answered, provide us with vital information and insights into your environmental conditions. As I explained in my rather lengthy post, it's important to know the variable factors such as Ambient temperature, as well as which Prime95 test you've run. As there are differences, it's all about understanding the specifications and test metods that Intel uses.

Please state which Prime95 test was used.
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July 24, 2013 2:15:51 AM

CompuTronix said:
In order to best help you, we sometimes ask certain questions, and when answered, provide us with vital information and insights into your environmental conditions. As I explained in my rather lengthy post, it's important to know the variable factors such as Ambient temperature, as well as which Prime95 test you've run. As there are differences, it's all about understanding the specifications and test metods that Intel uses.

I used the heat test torture test.
Please state which Prime95 test was used.


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July 24, 2013 12:35:01 PM

Well guys, I put the stock antec fan back on the radiator and although its incredibly loud, I seem to be running 7-10 degrees colder.
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