Windows 8 and 8.1 Forums

Windows 8 is showing only 4 cores, instead of 8?

  1. #1

    Posts : 1
    Windows 8

    Windows 8 is showing only 4 cores, instead of 8?

    I am an AMD FX 8320 eight core processor, 3.5 ghz
    i installed Windows 8 Pro, but when i checked task manager, it is only showing 4 cores.
    Please help

      My System SpecsSystem Spec

  2. #2

    Posts : 1,093
    Windows 8 Pro Windows 8.1 Preview

    Run msconfig and go to boot> advanced options> make sure the number of processors is not set to 4 (uncheck the box if checked).
      My System SpecsSystem Spec

  3. #3

    Posts : 1,093
    Windows 8 Pro Windows 8.1 Preview

    Update: According to Passmark, it only has 4 physical cores (w/2 logical cores per physical core).

    AMD FX-8320 Eight-Core
    Description: Socket: AM3+, Clockspeed: 3.5 GHz, Turbo Speed: 4.0 GHz, No of Cores: 4 (2 logical cores per physical), Max TDP: 125 W
    Other names: AMD FX(tm)-8320 Eight-Core Processor
    CPU Launched: NA
    CPUmark/$Price: 53.29 Overall Rank: 67
    Last Price Change: $153.61 USD (2012-10-27)
      My System SpecsSystem Spec

  4. #4

    Posts : 59
    windows 8.1

    something not right, bios settings or something..

    AMD FX-Series FX-8320 - FD8320FRW8KHK / FD8320FRHKBOX

    it has 8 cores.

    did previous operating system show 8 cores?
      My System SpecsSystem Spec

  5. #5

    Posts : 1,093
    Windows 8 Pro Windows 8.1 Preview

    Hi dskiller,

    I thought that Passmark description might not be correct but I threw it up for grabs. Anyway, here is another individual that had the exact same problem and my previous msconfig recommendation fixed his rig to show the 8 cores correctly. Thanks for chiming in!

    Should the AMD FX-8320 Vishera show up as 4 cores in windows? - AMD - CPUs
      My System SpecsSystem Spec

  6. #6

    The device manager will also tell you how many cores you have.
      My System SpecsSystem Spec

  7. #7

    Posts : 1,093
    Windows 8 Pro Windows 8.1 Preview

    I further investigated why Passmark described the FX-8320 as having: No of Cores: 4 (2 logical cores per physical) and I have found out why. See image:

    This is the architecture of the FX-8320. Note that it only has "4 true cores" and that each split core shares the L2 and L3 cache.

    Attachment 24725

    So, now I understand why Passmark identified the # of cores as 4. What you really have is 4 true cores sharing resources (somewhat like the Intel physical/logical processor arrangement). Nice job AMD, you fooled me on that one! However, I still think they will show up as 8 cores in Windows 8.
      My System SpecsSystem Spec

Windows 8 is showing only 4 cores, instead of 8?
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