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Are high idle temps ok for the CPU?

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September 20, 2013 9:30:11 AM

I lowered my CPU fan speed when not on full load to be more quiet. Idle temps went from 40C to 60C but load temps are unchanged at 78C max because the fan powers up.

Is that ok for the CPU?

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September 20, 2013 9:38:57 AM

What CPU & heatisnk/fan do you have? 60c idle is very high - almost like your heatsink isn't on properly. 78c is quite high load too. I have an i5-3570 that idles at 27-33c (depending on time of year) even with a slow silent 700rpm fan.
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September 20, 2013 9:48:23 AM

BSim500 said:
What CPU & heatisnk/fan do you have? 60c idle is very high - almost like your heatsink isn't on properly. 78c is quite high load too. I have an i5-3570 that idles at 27-33c (depending on time of year) even with a slow silent 700rpm fan.


i5-3350p in a really really small mini-itx case. Airflow is bad that's why. The heatsink is on properly.
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September 20, 2013 9:54:15 AM

LoliElin said:
i5-3350p in a really really small mini-itx case. Airflow is bad that's why. The heatsink is on properly.

Maybe try reapplying whatever thermal paste you used (ie, clean off the old one and put the new one on)? Even in a Mini-ITX, idle temps should be under 60c. What program are you using to monitor temps?
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September 20, 2013 9:55:55 AM

BSim500 said:
LoliElin said:
i5-3350p in a really really small mini-itx case. Airflow is bad that's why. The heatsink is on properly.

Maybe try reapplying whatever thermal paste you used (ie, clean off the old one and put the new one on)? Even in a Mini-ITX, idle temps should be under 60c. What program are you using to monitor temps?


Hwinfo64.

The idle temps are so high because I turned down the CPU fan when the CPU is not on full load. So instead of a range of 40C - 78C from idle to load, it's now 60C to 78 C from idle to load.

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September 20, 2013 10:00:11 AM

LoliElin said:
Hwinfo64.

The idle temps are so high because I turned down the CPU fan when the CPU is not on full load. So instead of a range of 40C - 78C from idle to load, it's now 60C to 78 C from idle to load.

Even so that's rather high just for idling (less than 10w) unless all of your fans stop altogether? Do you still get the same temps with CoreTemp or HWMonitor?
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September 20, 2013 10:03:38 AM

BSim500 said:
LoliElin said:
Hwinfo64.

The idle temps are so high because I turned down the CPU fan when the CPU is not on full load. So instead of a range of 40C - 78C from idle to load, it's now 60C to 78 C from idle to load.

Even so that's rather high just for idling (less than 10w) unless all of your fans stop altogether? Do you still get the same temps with CoreTemp or HWMonitor?


Yeah I do. 60C is actually around 30% load. At like 7-8% load is when it idles and that's 50C. 100% load is 78C Are these sustainable idle temps?
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September 20, 2013 10:45:32 AM

LoliElin said:
Yeah I do. 60C is actually around 30% load. At like 7-8% load is when it idles and that's 50C. 100% load is 78C Are these sustainable idle temps?

Well it's within operating tolerance. Personally, I'd prefer them both at least 10c cooler. Is there no in between fan setting between the one that runs 40c idle & the one that does 60c idle?

Another option if you haven't overclocked it (and if your motherboard supports it) is to slightly reduce the VCore (CPU voltage) in the BIOS by say -0.05 to -0.1v. Not all mini-ITX motherboards will do that though.
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September 20, 2013 11:22:01 AM

BSim500 said:
LoliElin said:
Yeah I do. 60C is actually around 30% load. At like 7-8% load is when it idles and that's 50C. 100% load is 78C Are these sustainable idle temps?

Well it's within operating tolerance. Personally, I'd prefer them both at least 10c cooler. Is there no in between fan setting between the one that runs 40c idle & the one that does 60c idle?

Another option if you haven't overclocked it (and if your motherboard supports it) is to slightly reduce the VCore (CPU voltage) in the BIOS by say -0.05 to -0.1v. Not all mini-ITX motherboards will do that though.


Will that lower clock speed too?
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September 20, 2013 11:39:59 AM

LoliElin said:
Will that lower clock speed too?

No. "Under-volting" is different from "under-clocking". All CPU's have a certain overhead (slightly more voltage than they need at stock operating frequency). Some use that for overclocking (upping the speed), but you can also take advantage of that overhead and do the reverse - keep the same CPU frequency, but just very slightly reduce the voltage. It won't run any slower, but it might reduce the amount of heat produced by 5-10w. Not all mini-ITX motherboards support that though.
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September 20, 2013 11:56:36 AM

BSim500 said:
LoliElin said:
Will that lower clock speed too?

No. "Under-volting" is different from "under-clocking". All CPU's have a certain overhead (slightly more voltage than they need at stock operating frequency). Some use that for overclocking (upping the speed), but you can also take advantage of that overhead and do the reverse - keep the same CPU frequency, but just very slightly reduce the voltage. It won't run any slower, but it might reduce the amount of heat produced by 5-10w. Not all mini-ITX motherboards support that though.


I went into bios and changed the voltage from 1.1V to 1.0V. How can I test if this is ok?
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September 20, 2013 12:10:23 PM

LoliElin said:
I went into bios and changed the voltage from 1.1V to 1.0V. How can I test if this is ok?

I was going to suggest you start small (-0.05v, then go to -0.1v). Basically, you boot into Windows and normally you'd run a stability testing tool like Intel Burn Test or Prime, but they very heavily load your CPU far more than you have been (not a good idea if you're alreday running that hot) and so you couldn't really tell if it's cooler using those software vs your existing usage.

Really, just run it as normal as you have been and see what the idle / load temps say. If it crashes / locks up at any time, you've gone too far (try -0.05v).
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