3 Replies Latest reply on Jun 22, 2015 10:38 AM by hansb_intel

    I have i7 5820k which is very slow with heavy multi threading.

    eshagam

      I have i7 5820k, which runs on MSI or Gigabyte motherboard.

      it is very slow with heavy multi threading, It runs half speed as i7 3770k or i7 2600

      heavy mem access is very fast for 5820k,

      heavy compute task is fast for 5820k,

      the application does not use disk or display, only cpu and memory.

      I have replaced both cpu and motherboard, with no difference.

        • 1. Re: I have i7 5820k which is very slow with heavy multi threading.
          hansb_intel

          Hello eshagam,

           

          In order to better assist you, please copy the report for the Intel Processor Diagnostic Tool. http://www.intel.com/support/processors/sb/CS-031726.htm

          • 2. Re: I have i7 5820k which is very slow with heavy multi threading.
            eshagam

            Hi,

             

            The diagnostic tool did not find any problem

             

            I compared the 5820k with i5

            i7 5820k 3.3ghz  Operation Per Second--> 5.98121e+006

            Intel Core i5 760 2.80GHz    Operation Per Second--> 3.98747e+006


            I suspect that all 6 core will be slow on frequent multi threading swap


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

            --- Testing Processor 1 ---

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

             

             

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

             

             

            --- Start Time: 06/20/2015 11:48:36---

             

             

            --- Skipping Config ---

             

             

            --- Reading CPU Manufacturer ---

             

            Expected --> GenuineIntel

            Detected --> GenuineIntel

            Found --- Genuine Intel Processor ---

             

            --- Temperature Test ---

             

            Temperature Test Passed!!!

             

             

            Temperature = 57 degrees C below maximum.

             

             

            --- Reading Brand String ---

             

            Detected Brand String:

            Intel Core i7-5820K 3.30GHz

             

             

            Brand String Test Passed!!!

             

             

            --- Reading CPU Frequency ---

             

            Expected CPU Frequency is --> 3.30

             

             

            Detected CPU Frequency is --> 3.30036

             

            CPU Frequency Test Passed!!!

             

             

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

             

             

            --- Running Base Clock test ---

             

             

            Detected Base Clock --> 100

            Base Clock test Pass ---

            --- Unable to retrieve any QPI Link device id ---

            ..Skipping QPI rate Test..

             

            Skipping QPI rate Test

             

             

            --- Running Floating Point test ---

             

             

            Million Floating Points per Second, MFLOPS --> 403.2

            Floating Point Test Pass ---

             

            --- Running Prime Number Generation Test ---

             

             

            Operation Per Second--> 5.98121e+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 --> 15360

             

             

            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 --> 32.00GB

             

             

            --- Integrated Memory Controller Stress Test ---

             

             

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

             

             

            Integrated Memory Controller Test Pass!!!

             

            ..Platform Controller Hub Test not supported curent chipset..

            ..Skipping Platform Controller Hub Test..

             

            Skipping Platform Controller Hub Test

             

             

             

            --- Querying for Intel(R) Integrated Graphics Device (IGD) ---

             

            ..Detected 8086 as Vendor ID on Device 2 on Intel(R) processor..

            ..Intel(R) Integrated Graphics Device Presence Detection Passed..

             

             

            ..2D Graphics Visual Display Passed..

             

             

            ..Graphics Visual Display Passed..

             

             

            ..Rotating Display Passed..

             

             

            --- CPU Load ---

             

             

            --- Load Level = 8

             

             

            CPU Load Passed!!!

             

             

            --- Temperature Test ---

             

            Temperature Test Passed!!!

             

             

            Temperature = 51 degrees C below maximum.

             

             

            --- Test End Time: 06/20/2015 11:52:36---

             

             

             

            System Information

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

            Processor Name: Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz

            Processor Information: Intel64 Family 6 Model 63 Stepping 2

            Number of Physical Cores: 6

            Number of Logical Cores: 12

            Installed System Memory: 32 GB

            Operating System: Microsoft Windows 7 Home Premium 64-bit

            Graphics Information: Standard VGA Graphics Adapter

            System Product: X99-UD4-CF

            System BIOS: F5

            1 of 1 people found this helpful
            • 3. Re: I have i7 5820k which is very slow with heavy multi threading.
              hansb_intel

              Hello eshagam,

               

              The IPDT shows that you have a healthy processor, I would suggested that you check how the application uses multithreading, this does not seem to be a hardware issue but rather something in the way the app runs with more cores and threads.