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74c hot for 3.8 920 D0?

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September 24, 2009 3:01:42 AM

mobo: ex58-ud3r rev 1.6 FB
cpu: i7 920 D0 @3.8Ghz 44c idle 74c load
ram: ocz obsidian 1600 3x2gb @1520Mhz 9-9-9-24
cpu cooler: scythe mugen 2 (AS5)
case: HAF 932 stock

• 20x190 VTT 1.195v Vcore 1.28125v RAM: 1.64v
• All power saving features off
• HT on Turboboost off

I can run completely stable with those settings. By stable I mean pass the 14k test in Prime95, pass CineBench at least 5 consecutive times, pass Vantage no problems, run Photoshop all day (the purpose for this computer), and play any games I have.

But I mean, from what I've read (I've read tons) those are reasonably low voltages, with a scythe mugen 2, on a D0 920, in a 932 case, with ambient room temp of ~60F-67F. So why in the world are my 3.8Ghz temps so high?

I want to do 4Ghz, but any time I get close to stable I'm pushing 1.3VTT and >1.3Vcore, with temps 48c idle and 78c load. Any help??

Also, 4Ghz with RAM at spec 1600Mhz gives me 38 second CineBench. 2 seconds faster than my 3.8Ghz with 4c higher temps. Is it worth it to put effort into achieving a cooler 4Ghz?

More about : 74c hot 920

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September 24, 2009 3:08:42 AM

That's way the hellio to hot IMO. Have you tried to remove the cpu heatsink and reapply thermal paste to make sure you got a good even application? I would give that a second go and see if that helps any first.
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September 24, 2009 3:28:32 AM

Remounting the cooler seems innevitable. I might as well lap the CPU while I'm at it. But just in case:

Gigabyte released bios FD4 at the beginning of this month. It is supposed to "fix abnormal CPU temperature." Does this seem like an abnormal CPU temperature issue? 45c/74c with scythe mugen 2 in HAF 932?!
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September 24, 2009 3:31:29 AM

It seems abnormal if the cpu heatsink is correctly seated with the correct amount of thermal compound applied. After you try that you will confirm that's not the problem and can look at the BIOS update. Have you flashed to the latest BIOS yet?
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September 24, 2009 4:02:43 AM

I guess I'll lap and reseat tomorrow.

As far as the bios, I flashed to the newest non-beta bios.

Mine is FB from May 4th. The newest bios is beta FD4 from the first of this month.
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September 24, 2009 4:29:03 AM

After I get it stable, can I safely enable the power saving features in bios?
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a b K Overclocking
September 24, 2009 8:30:11 AM

hash3m said:
Gigabyte released bios FD4 at the beginning of this month. It is supposed to "fix abnormal CPU temperature." Does this seem like an abnormal CPU temperature issue? 45c/74c with scythe mugen 2 in HAF 932?!

Guys, let's not blur the distinction between CPU temperature and Core temperature. BIOS affects CPU temperature only, but has nothing to do with Core temperature. Also, never assume that uncalibrated temperatures are accurate. My objective is to assure that enthusiasts understand Intel's specifications, standards and test methods, so they can better decide how to apply and manage their overclocking options.

From Intel's Processor Spec Finder - http://processorfinder.intel.com/List.aspx?ParentRadio=...

All i7 9xx variants:

Vcore Max 1.375v
Tcase Max (CPU temperature) 68c
Tjunction (Core temperature) 73c

From the Core i7 and Core 2 Temperature Guide - http://www.tomshardware.com/forum/221745-29-sticky-core...


"Section 1: Introduction

Core i and Core 2 processors have 2 different types of temperature sensors; a CPU case (not computer case) Thermal Diode centered under the Cores, and Digital Thermal Sensors located on each Core. The case Thermal Diode measures Tcase (Temperature case), which is CPU temperature, and the Digital Thermal Sensors measure Tjunction (Temperature junction), which is Core temperature. Since these sensors measure 2 distinct thermal levels, there is a 5c temperature difference between them, which is Tcase to Tjunction Gradient. Core i7’s / i5’s and Core 2 Quad’s have 1 Tcase and 4 Tjunction sensors, while Core 2 Duo's have 1 Tcase and 2 Tjunction sensors ...

... The monitoring utilities provided by motherboard manufacturers monitor CPU temperature, while some popular freeware utilities monitor Core temperatures ... Real Temp ... is recommended for users interested in monitoring Core temperatures only ... SpeedFan monitors Tcase (CPU temperature) and Tjunction (Core temperature) ... "


The Thermal Specification shown in Intel's Processor Spec Finder is Tcase Max (CPU) not Tjunction (Core), which is a very common misconception among most enthusiasts. Since there's a 5c gradient between the CPU sensor and the Core sensors, (shown in the following Intel document) - http://arxiv.org/ftp/arxiv/papers/0709/0709.1861.pdf - just add 5c to the value shown in the Spec Finder to determine the corresponding Core temperature, which is 73c for all Core i7 9xx variants.

Intel's second and frequently misunderstood Thermal Specification, Tjunction Max, (100c for all Core i variants) applies to overtemp protection such as Throttle and Shutdown, so you don't toast your transistors. As such, any i7 Core temperatures which exceed 73c should be considered "overtemp". Further, when specifications are exceeded, then processor degradation becomes a concern, which is explained in the following AnandTech article - http://anandtech.com/cpuchipsets/intel/showdoc.aspx?i=3...

Prime95 Small FFT's is the Standard for processor thermal testing, because it's a steady-state 100% workload which yields steady-state temperatures, whereas Blend is a memory cyclic workload which yields fluctuating processor temperatures. Small FFT's will reach 97% thermal saturation within 7 to 8 minutes, so a 10 minute test is adequate. Thermal testing should be conducted as close as possible to 22c (72f) Standard ambient, with case covers removed, the computer clear of any desk enclosures, and all fans at 100% RPM to eliminate cooling variables, and to produce consistent and repeatable results for comparisons. If the Gradient between CPU temperature and "mean" (average) Core temperature is not ~ 5c, then BIOS is incorrectly coded. CPU temperature and Core temperatures can be individually calibrated in SpeedFan by following the Calibrations Section in the Temperature Guide.

OCCT and Burn Test (reminiscent of TAT) use LinPack, which shows thermal signatures that resemble the ups and downs of a bad day at the stock market, and cycle between light workloads, through test segments which spray all processor registers with all one's, (100% thermal load, which equates to 115% workload), and can push an overclocked i7 at Vcore Max 1.375 with HT enabled, right on past Tcase Max to ring the Tjunction Max bell like a fire alarm! :o 

Since there are very few applications or games that will spike, let alone sustain processor workloads beyond 70% to 85%, utilities which load all registers with all one's are not representative of real-world computing. While these utilities are certainly very useful for stability testing, they are inappropriate for thermal testing. The 3DMark benches are also excellent for stability testing, as are application for ripping and encoding.

The best anaolgy to make sense of CPU temperature and Core temperature is to compare them to a 4 cylinder car that has 5 temperature guages; 4 of the 5 guages are cyclinder head temperatures (closest to the heat source), and the 5th guage is the overall engine temperature, which is 5c lower than the other 4 guages, and is the temperature guage with which we're all familiar. We know that red-line for the i7 9xx is 68c (Tcase Max)on the engine temp guage and 73c(Tjunction) on the cylinder head temp guages , but if we push the engine too hard and peg all the guages, (95c Tcase overtemp / 100c Tjunction Max) then the engine will shut down.

If you'd like to learn more about processor temperatures, then just click on the link in my signature.

Hope this helps,

Comp :sol: 
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a b à CPUs
September 24, 2009 11:46:44 AM

Wow, I hope you copied and pasted that from somewhere, lol. ;) 
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a b K Overclocking
September 24, 2009 12:01:30 PM

I am not in the habit of plagiarizing, however, my post is compiled in part from original works I have posted in several other threads. Also, if you click on the link in my signature, you might note that I'm the author.
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a b à CPUs
September 24, 2009 12:43:00 PM

Don't take my comment personally. That's a very detailed comment you provided that would take a fair amount of time to create on a whelm. It should be more of a compliment if you read it as its intended. ;) 
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a b K Overclocking
September 24, 2009 4:32:57 PM

englandr753 said:
Don't take my comment personally ... It should be more of a compliment if you read it as its intended. ;) 

I didn't ... and thank you. I was simply making it clear that I didn't just fall off the back of the fruit truck this morning. I've been plugging away at this for over 2 1/2 years, sometimes just one individual at a time, so that enthusiasts might eventually understand how processor temperatures actually work, and dispel all the misinformation and misconceptions. Hopefully, if I post this information frequently enough, it'll begin to have a positive impact within the overclocking community.
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September 28, 2009 5:39:13 PM

Your temps are fine. (what are you measuring them with?). Bump up to 1.3vcore and do 4.0GHz

I'm running at 4.0GHz with 1.3vcore and idle around 55C idle(on highest core per OCCT temps, Coretemp shows 52C). On the OCCT torture test (HT on w/ Large dataset) I hit 85C within the hour long test.
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September 28, 2009 10:49:34 PM

I don't think those temps are ok. Maybe 50-55*c on load is fine but not on idle. I guess thats fine if you intend to replace your system in 1-2 years...
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September 28, 2009 11:10:34 PM

^ without any OC and all stock i idle at like 40C and load at 70C. That is with my cooler.
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September 29, 2009 3:03:46 AM

That sounds acceptable, torture testing will take it higher than gaming or most other apps you can run normally. I just wouldn't want to run my cpu at 85*c for any length of time since I want mine to last a while...
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September 29, 2009 7:25:51 AM

englandr753 said:
I don't think those temps are ok. Maybe 50-55*c on load is fine


You are living in your own little world... 50-50C load cannot be achieved, even with the best air cooler at stock(2,66GHz).
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a b à CPUs
September 29, 2009 11:00:49 AM

Stock clocks, not overclocked. No fantasy about that.
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September 29, 2009 11:07:35 AM

jay2tall said:
^ without any OC and all stock i idle at like 40C and load at 70C. That is with my cooler.



These temps at regular operating intervals is acceptable but still higher than what I like to run. The I7 may be able to run hotter and from what I hear it does run hotter than the Core 2/Quads so since I am still in the Core 2 Quad realm those temps seem to hot to me and I would work on trying to get lower if possible.

Does anyone have any links showing its ok to run near 80-90C on the I7? I would love to read it...
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September 29, 2009 12:35:32 PM

^ normal load never reaches above 70-75ish for me. 85C is the highest it gets through the OCCT test with all 8 virtual cores at 100%.
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August 1, 2014 4:55:35 AM

Those are totally normal temps for i7 9xx series specially when overclocked. you very okay with those temps OP, these series of i7 are very designed and okay to take quite a heat, the stock default tmax or MAX level before it shuts down is 100-110. so you are very okay if you getting that amount underload. i have been running this i7-920 with load temps of 86-90c and its running quite fine after 7 years still.
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