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I7-2600K speed drops to 1600MHz on DZ68DB when running Prime95

idata
Community Manager
7,103 Views

Hello,

I've just put together a system with DZ68DB Intel motherboard and I7-2600K CPU. Right now: no overclocking, liquid cooling. When I'm testing it by running Prime95 torture test, the CPU speed drops to 1600Mhz shortly after the start as shown by "CPU-Z". The temperatures at this time are in low 50's C as shown by "Core Temp". What could be wrong?

Thanks

1 Solution
idata
Community Manager
1,578 Views

Hello,

I recommend you guys to run the Intel® Processor Diagnostic Tool and keep your speed monitor open while you run it, you will see the frequencies of the processor raise.

 

http://downloadcenter.intel.com/SearchResult.aspx?lang=eng&keyword=Intel%C2%AE%20Processor%20Diagnos... http://downloadcenter.intel.com/SearchResult.aspx?lang=eng&keyword=Intel%C2%AE%20Processor%20Diagnos...

 

Regards

 

View solution in original post

32 Replies
idata
Community Manager
1,497 Views

Ladies and Gentlemen,

The question of mine appears hard to answer. Maybe it was the way it's composed or nobody has an explanation for my problem so far. At this point, I will greatly appreciate any ideas regarding the issue, even though they are not based on the real experience or deep understanding. Just give me something to try and to think about please.

Thank you,

OKYHb

idata
Community Manager
1,497 Views

Hi OKYHb,

the sandy bridge cpus will throttle themselves to 1600mhz when not under heavy load. I understand that prime is supposedly stress testing the CPU but it seems like either theres a problem with the motherboard settings, or that the prime tests you are running are not triggering the fullspeed and turbo modes.

 

Think of it this way, the cpu sits at 1.6 all the time when not in use (this is built into cpu management), then under load it will jump up to its native 3.4 ghz, then after it decides its under 'heavy' load it will kick into turbo mode and overclock all 4 phases to 3.8ghz.

1. Make sure prime is set to run 4 threads, and play around with different stress cycles (though prime is not likely to be the problem). Its possible you are looking at the clock speed of one core which is idle whilst the other is at full load due to not running prime on all cores.

2. Try OCCT. See if the cpu still sits at 1600.

3. Confirm the cpu program you are using to read the cpu is REAL TIME. Some programs will probe the cpu at initialization but will not update speeds real time. Try CPUid, CPU-Z or similar program with real time clock and open the real time clock window. You should see the frequency moving up and down in a real time clock viewer even sitting idle at 1600, (1599.9, 1600.1, 1600.0 and so forth)

4. Failing all this, go into bios and DISABLE turbo boost and all smart frequency controlling and stepping settings. Make sure the CPU is set to sit at native 3.4 ghz. With some motherboards means disabling ALOT of crap, anything that says thermal, stepping or automatic anything really relating to the cpu except voltage (messing with this could damage your computer.

Regards, Paul S

idata
Community Manager
1,497 Views

Paul,

Thanks for your reply.

1. In my case, Prime95 was set to 4 threads when hyperthreading is disabled, and 8 threads with hyperthreading.

2. I will check out OCCT.

3. I was using CPU-Z.

4. I did try to disable turbo boost, put my CPU in high performance mode, disable SpeedStep and C1E. The CPU frequency still drops. It's not just Prime95, I was doing video encoding and the speed dropped. I ran PCMark7, the speed dropped while doing the same kind of operation.

I'm in touch with Intel support now. They couldn't reproduce my problem. At this point, I believe my motherboard is defective.

Thanks again,

OKYHb

idata
Community Manager
1,497 Views

Hi there,

I got exactly the same problems. From the first day on.

I would like to add a little more detail:

- the CPU throttles down to 1600 MHz (which is unacceptably slow when doing some heavy work) as soon as the sum of all 4 cores exceeds 250°C (at least approximately). And it comes back to 3400 MHz at may 225..230°C (this one is more difficult to watch). It toggles than back and forth.

- reducing the core voltage down to the point where it is just booting delays the thermal throttling and shortens the periods where it is at 1600 MHz. But it is impossible to run it at the nominal CPU clock speed for a longer time. Fiddling around with the power and current limits doesn't change the situation either.

- I got a pretty decent water cooling using a Watercool Heatkiller 3.0 cooling block. And I have a case fan blowing on the socket area to cool the components of the voltage converters - their temperature changed from *very* hot to moderate after the installation of that fan.

- The case is a big Yeong-Yang cube YY-420 with plenty of air ventilation.

- Enermax Platimax 500W PSU. Asus GTX-650TI video card.

- Bios is up to date.

The issue seems to be present from the very beginning of the board ... http://www.tomshardware.com/reviews/z68xp-ud3-dz68db,2980-17.html http://www.tomshardware.com/reviews/z68xp-ud3-dz68db,2980-17.html ... seems like this was the worst Intel board I ever got. :-(

Booting is often extemely slow. I have to wait for maybe 30 seconds until the board hands over to the OS. But after that everything runs rock stable. The mild overclocking I tried so far is working just as stable as standard clock speed. Just that the temperature barrier is hit way sooner.

If there was some magic cure... it would be very welcomed. Otherwise I dump it into the waste bin as soon as the Ivy Bridge EP is out...

Best regards

Peter

VDerk
New Contributor III
1,497 Views

I also have the DZ68BC with a i7-2600K and lots of issues with this board (i7-2600K is detected as an unsupported) CPU for example, since BIOS 37).

It seems however that some problems are a combination of the hardware and the BIOS. You could contact Intel for a replacement. Or buy an alternative used Z68\Z77 board, probably the cheapest option.

idata
Community Manager
1,579 Views

Hello,

I recommend you guys to run the Intel® Processor Diagnostic Tool and keep your speed monitor open while you run it, you will see the frequencies of the processor raise.

 

http://downloadcenter.intel.com/SearchResult.aspx?lang=eng&keyword=Intel%C2%AE%20Processor%20Diagnos... http://downloadcenter.intel.com/SearchResult.aspx?lang=eng&keyword=Intel%C2%AE%20Processor%20Diagnos...

 

Regards

 

View solution in original post

idata
Community Manager
1,497 Views

Victor,

Thank You for Your response!

I ran the tool, and it told me "pass" in all subtests.

The starting temperature was 66° below limit before the test and 56°C after the test.

My next action is to install a second radiator to get the CPU temperature under load

down.

Btw, during the test Coretemp showed some garbage, i.e. it stated a power consumption

of 799 Watts... Temperature at the end of the test was at about 59°C.

But to me this looks all pretty inconspicuous.

Best regards

EKise
Beginner
1,497 Views

Hello,

I have the same issue I7-2600K on DZ68DB, BIOS 0043!

I turned off SpeedStep, C State, Turbo Boost in BIOS settings, but CPUID shows me:

"CPU Clock - 1596.x , Multiplier - 16x jumping to CPU Clock - 3392.x, Multiplier - 34".

How can I get the constant CPU speed?

Thanks,

Evgeny

IUman
Honored Contributor II
1,497 Views

Hi,

Please Access the BIOS press F9 on your keyboard to set the BIOS to defaults and then press F10 to save the changes.

Did you try running the Intel® Processor Diagnostic Tool from the link Victor_Intel posted above? If you run the Intel® Processor Diagnostic Tool please post results here.

At the top of the Window is a Menu Bar. The "File" Menu allows you to open the TestResults.txt file using Notepad.

Best regards,

Ivan

EKise
Beginner
1,497 Views

Hi Ivan,

thanks for your answer!

I've changed the BIOS settings to default and did the Intel Processor Test. The results are below:

 

---------------------------

--- Testing Processor 1 ---

---------------------------

--- IPDT64 - rev 2.20.0.0.W.MP ---

--- Start Time: 01/21/2016 09:48:00---

--- Skipping Config ---

--- Reading CPU Manufacturer ---

Expected --> GenuineIntel

Detected --> GenuineIntel

Found --- Genuine Intel Processor ---

--- Temperature Test ---

Temperature Test Passed!!!

Temperature = 53 degrees C below maximum.

--- Reading Brand String ---

Detected Brand String:

Intel Core i7-2600K 3.40GHz

Brand String Test Passed!!!

--- Reading CPU Frequency ---

Expected CPU Frequency is --> 3.40

Detected CPU Frequency is --> 5.06123

CPU Frequency Test Passed!!!

Expected frequency - The highest frequency at which the tested processor was manufactured to operate

Detected frequency - The frequency at which the tested processor is currently operating

Power management modes can create marginally higher or lower detected frequency

than expected frequency. Small variations in clock frequencies are common.

--- FSB NOT Supported on this Processor ---

--- Running Base Clock test ---

Detected Base Clock --> 101

Base Clock test Pass ---

..QPI rate Test not supported..

..Skipping QPI rate Test..

Skipping QPI rate Test

--- Running Floating Point test ---

Million Floating Points per Second, MFLOPS --> 432

Floating Point Test Pass ---

--- Running Prime Number Generation Test ---

Operation Per Second--> 4.65205e+006

Prime Number Generation Test Pass ---

--- Reading Cache Size ---

- Detected L1 Data Cache Size --> 4 x 32

- Detected L1 Inst Cache Size --> 4 x 32

- Detected L2 Cache Size --> 1024

- Detected L3 Cache Size --> 8192

Cache Size Test Passed!!!

--- Determining MMX - SSE capabilities ---

--- CPU FEATURES DETECTION FOR ---

--- MMX SSE ---

MMX - MMX Supported --> Yes

SSE - SSE Supported --> Yes

SSE2 - SSE2 Supported --> Yes

SSE3 - SSE3 Supported --> Yes

SSSE3 - SSSE3 Supported --> Yes

SSE4.1 - SSE4.1 Supported --> Yes

SSE4.2 - SSE4.2 Supported --> Yes

--- MMX SSE - capabilities check complete ---

MMX Test Result --- PASS

SSE Test Result --- PASS

SSE2 Test Result --- PASS

SSE3 Test Result --- PASS

SSSE3 Test Result --- PASS

SSE4.1 Test Result --- PASS

SSE4.2 Test Result --- PASS

MMX SSE Testing Passed !!

--- Determining AVX AES PCLMULQDQ capabilities ---

--- CPU FEATURES DETECTION FOR ---

--- AVX/AES/PCLMULQDQ ---

AVX - Advanced Vector Extensions Supported --> Yes

AVX OS Support - AVX Operating System Supported --> Yes

AES - Advanced Encryption Standard Supported --> Yes

PCLMULQDQ - Polys Carry-Less Multiply Supported --> Yes

--- AVX AES PCLMULQDQ capabilities check complete ---

AVX Compare Test Result --- PASS

AES Test Result --- PASS

PCLMULQDQ Test Result --- PASS

AVX AES PCLMULQDQ Testing Passed !!

--- Reading Memory Size ---

Detected Memory Size is --> 24.00GB

--- Integrated Memory Controller Stress Test ---

--- Integrated Memory Controller Stress Test Pass!!! ---

Integrated Memory Controller Test Pass!!!

Chipset : Intel(R) 6 Series Chipset or Intel(R) C...

IUman
Honored Contributor II
1,497 Views

I have checked the result for the test and I can see the processor is over clocked, you can find out about it when you check the Expected CPU Frequency is --> 3.40 but the Detected CPU Frequency is --> 5.06123.

That's out of the processor specifications and at that frequency any issue can be expected, you can over clock a processor and it can work fine for a well but at some point it will fail, I strong recommend running this processor under the processor specifications and use the RAM at 1066 MHz or 1333 MHz and at 1.5V which is the recommended frequency for this processor.

You can see the processor specifications here:

http://ark.intel.com/products/52214/Intel-Core-i7-2600K-Processor-8M-Cache-up-to-3_80-GHz Intel® Core™ i7-2600K Processor (8M Cache, up to 3.80 GHz) Specifications

If you are interested in over clocking your system please check this website for better assistance.

http://www.overclock.net/ http://www.overclock.net/

NOTE: This link is being offered for your convenience and should not be viewed as an endorsement by Intel of the content, products, or services offered there.

Warning: Altering clock frequency and/or voltage may: reduce system stability and useful life of the system, processor, and other system components; (ii) cause the processor and other system components to fail; (iii) cause reductions in system performance; (iv) cause additional heat or other damage; and (v) affect system data integrity. Intel has not tested, and does not warranty, the operation of the processor beyond its specifications. Intel has not tested, and does not warranty, the operation of other system components beyond their industry standard specifications. Intel assumes no responsibility that the processor and other system components, including if used with altered clock frequencies and/or voltages, will be fit for any particular purpose.

EKise
Beginner
1,497 Views

Hi Ivan,

thank you very much for your answers!

I should mention that I did not any overclocking and usually don't plan to do it!

I did this test after I've set BIOS settings by default. Now I checked BIOS once more and I found the warning message on "Performance" page. I mean there are no settings shown, only the warning about unsupported processor speed or something like this. This message appears on "Performance" page if I try to set BIOS default settings. Do you have any suggestions?

 

Thank you,

Evgeny

 

IUman
Honored Contributor II
1,497 Views

You will need to make sure that the RAM is running at 1066 MHz or 1333 MHz and at 1.5V; you should be able to check on that under performance in the BIOS, you will see there the memory configuration. You will see the memory voltage and if the RAM has XMP (Extreme Memory Profile) disable the XMP.

EKise
Beginner
1,497 Views

Hi Ivan,

I checked BIOS: RAM speed - 1333, voltage - 1.5 v. But(!) I have four modules installed (2x2 in dual channel mode) and they are different. 2 of them support XMP and 2 others not. Could it be a reason?

Here is a sample from CPU-Z repost:

DIMM # 1SMBus address0x50Memory typeDDR3Module formatUDIMMManufacturer (ID)Samsung (CE000000000000000000)Size4096 MBytesMax bandwidthPC3-10700 (667 MHz)Part numberM378B5273CH0-CH9 Serial number004FDF9FManufacturing dateWeek 02/Year 12Number of banks8Nominal Voltage1.50 VoltsEPPnoXMPnoAMPnoJEDEC timings tableCL-tRCD-tRP-tRAS-tRC @ frequencyJEDEC # 16.0-6-6-17-23 @ 457 MHzJEDEC # 27.0-7-7-20-27 @ 533 MHzJEDEC # 38.0-8-8-22-30 @ 609 MHzJEDEC # 49.0-9-9-24-33 @ 666 MHz

DIMM # 2SMBus address0x51Memory typeDDR3Module formatUDIMMManufacturer (ID)Crucial Technology (7F7F7F7F7F9B00000000)Size8192 MBytesMax bandwidthPC3-12800H (800 MHz)Part numberBLS8G3D1609DS1S00.Serial numberA5057B22Number of banks8Nominal Voltage1.50 VoltsEPPnoXMPyesXMP revision1.3AMPnoJEDEC timings tableCL-tRCD-tRP-tRAS-tRC @ frequencyJEDEC # 15.0-5-5-14-22 @ 444 MHzJEDEC # 26.0-6-6-16-26 @ 533 MHzJEDEC # 37.0-7-7-19-31 @ 622 MHzJEDEC # 48.0-8-8-22-35 @ 711 MHzJEDEC # 59.0-9-9-24-39 @ 800 MHzJEDEC # 610.0-9-9-24-39 @ 800 MHzJEDEC # 711.0-9-9-24-39 @ 800 MHzXMP profileXMP-1600SpecificationPC3-12800HVoltage level1.500 VoltsMin Cycle time1.250 ns (800 MHz)Max CL9.0Min tRP11.25 nsMin tRCD11.25 nsMin tWR15.00 nsMin tRAS30.00 nsMin tRC46.25 nsMin tRFC300.00 nsMin tRTP7.50 nsMin tRRD6.00 nsCommand Rate2TXMP timings tableCL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)XMP # 15.0-5-5-14-21-2T @ 444 MHz (1.500 Volts)XMP # 26.0-6-6-16-25-2T @ 533 MHz (1.500 Volts)XMP # 37.0-7-7-19-29-2T @ 622 MHz (1.500 Volts)XMP # 48.0-8-8-22-33-2T @ 711 MHz (1.500 Volts)XMP # 59.0-9-9-24-37-2T @ 800 MHz (1.500 Volts)XMP # 610.0-9-9-24-37-2T @ 800 MHz (1.500 Volts)XMP # 711.0-9-9-24-37-2T @ 800 MHz (1.500 Volts)
EKise
Beginner
1,497 Views

Hi Ivan, it's me again.

I tried to start my computer with different pairs of memory (see my previous post).

As a result - it doesn't matter which memory I put.

1. I can't set BIOS by default (regardless of type of memory), cause I got the same warning message.

2. The CPU speed and multiplier are still jumping, regardless of which memory type is installed.

Maybe it's a problem with motherboard or BIOS?

IUman
Honored Contributor II
1,497 Views

Hi,

Try removing the battery from your motherboard for at least 30 minutes and then put it back on and make sure the speed step is enabled in the BIOS and make sure the RAMs are not set in XMP mode.

Also, before starting your system add only one RAM at a time and see how it goes.

Best regards,

Ivan

EKise
Beginner
1,497 Views

Hi Ivan,

I did everything following your advice but with no luck.

I tried it with Samsung RAM modules they not support XMP. I tried to enable and disable SpeedStep, C1, Turbo Boost... same result.

The same jumping even with one RAM module and it's still impossible to set default settings in BIOS.

Accidentally I noticed that AIDA says me that C1 and SpeedStep are enabled, although I disabled them in BIOS. I don't understand how is it possible.

Thanks,

Evgeny

IUman
Honored Contributor II
1,497 Views

What BIOS version do you have?

You can access the BIOS and check for that in the BIOS or from Windows you can see it using the msinfo32 command.

Here are the steps to access the msinfo32 and see the BIOS version.

  1. Please press Windows Key + R to open the Run Menu
  2. Type msinfo32 and click OK
  3. While viewing the System Summary node go to File then Save (Please do not use Export)
  4. Save your MSINFO32 report as msinfo32.nfo on your desktop for easy access and then you can post it here.
EKise
Beginner
1,497 Views
Версия BIOSIntel Corp. DBZ6810H.86A.0043.2012.0615.2054, 15.06.2012

Hi Ivan, is it possible to attach these nfo file here?

Or should I post the text from WordPad?

Thanks,

Evgeny

EKise
Beginner
614 Views

I replaced the cooling paste on the CPU. I did Recovery BIOS Update.

Now CPU keeps the maximum frequency a little longer than before when I work with loaded audio projects. But after some time CPU-Z shows - "CPU Clock - 1596.x , Multiplier - 16x" and it leads to audio dropouts or crash.

There are still two big questions in this story:

1. Why after I set C1E and SpeedStep to disabled, AIDA steel shows them as enabled?

2. Why I get the warning message on Performance page every time I try to set BIOS by default?

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