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AMD FX-4100 shows only 2 cores?

I recently updated to windows 8.1 pro and task manager shows only 2 cores instead of 4.
Windows 7 displayed 4 cores.

CPU: AMD FX-4100 Quad Core 3.6 Ghz
MB: Asus m5a78l-m lx v2
GPU: ATi Radeon HD 6670 DDR 5

6 answers Last reply Best Answer
More about amd 4100 shows cores
  1. What task manager is actually reading is the bulldozer modules, logical cores is showing all 4 cores so your cpu is functioning fine.

    Task manager shows the exact same thing for my FX-8320, 4 cores, 8 logical processors.
  2. open resource monitor to make sure. go to the cpu tab and it should show 4 cores. I had a similar issue with my 6300 but it was with 7 and its why i went to 8. 7 would only show 3 cores, not 6 logical and 3, just straight 3 cores after a wipe it showed 6 then after I got everything updated it showed 3, I just got 8 since it runs faster anyway.
  3. ShadyHamster said:
    What task manager is actually reading is the bulldozer modules, logical cores is showing all 4 cores so your cpu is functioning fine.

    Task manager shows the exact same thing for my FX-8320, 4 cores, 8 logical processors.


    But Windows 7 showed 4 Cores. (I'm sorry , i am not an expert in Hardware and stuff :P ).


    @chairsgotoschool I'm already using windows 8.1
    and i checked the resource monitor it shows 4 cores ,2 are parked.
  4. Best answer
    if resource monitor shows 4 (parked or not) then you should be fine. its because fx uses modules, 2 cores per module so it says 2 cores (modules) resource monitor is the ultimate answer. for me with 7 like I said I had a hard time getting my fx to show all 6 in there. it was usually 3 cores with 1 parked but in 8 I have all 6. I tried several installs of 7 but sadly only 1 or 2 (of about 5) would show all my cores. If you want to unpark the cpu you can look into that.
  5. chairsgotoschool said:
    if resource monitor shows 4 (parked or not) then you should be fine. its because fx uses modules, 2 cores per module so it says 2 cores (modules) resource monitor is the ultimate answer. for me with 7 like I said I had a hard time getting my fx to show all 6 in there. it was usually 3 cores with 1 parked but in 8 I have all 6. I tried several installs of 7 but sadly only 1 or 2 (of about 5) would show all my cores. If you want to unpark the cpu you can look into that.


    Thanks man, resource monitor showed 4 cores 2 parked
    I unparked them.
  6. ShadyHamster said:
    What task manager is actually reading is the bulldozer modules, logical cores is showing all 4 cores so your cpu is functioning fine.

    Task manager shows the exact same thing for my FX-8320, 4 cores, 8 logical processors.
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