Athlon 64x2 only running sungle core/thread

hi my friend has just noticed his athlon64 x2 is only running a single core. iv looked into it and its not his bios(it recognises the cpu and the fact that it has 2 logical processor)but if you run dxdiag or cpu-z it says its an athlon64 x2 but only shows one logical core running. we though maybe it was a HAL setting in msconfig but that didnt work either.

we are a bit stumped on this and cant find any info on the subject so any help would be awsome.

Thanks, Eoin
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  1. this is his dxdiag info

    OS Name Microsoft® Windows Vista™ Home Premium
    Version 6.0.6001 Service Pack 1 Build 6001
    Other OS Description Not Available
    OS Manufacturer Microsoft Corporation
    System Name DAVE_ADMIN-PC
    System Manufacturer System manufacturer
    System Model System Product Name
    System Type X86-based PC
    Processor AMD Athlon(tm) 64 X2 Dual Core Processor 5800+, 3006 Mhz, 1 Core(s), 1 Logical Processor(s)
    BIOS Version/Date American Megatrends Inc. 1302, 2/13/2009
    SMBIOS Version 2.5
    Windows Directory C:\Windows
    System Directory C:\Windows\system32
    Boot Device \Device\HarddiskVolume3
    Locale United States
    Hardware Abstraction Layer Version = "6.0.6001.18000"
    User Name Dave_Admin-PC\Dave_Admin
    Time Zone Eastern Daylight Time
    Installed Physical Memory (RAM) 2.00 GB
    Total Physical Memory 2.00 GB
    Available Physical Memory 1.07 GB
    Total Virtual Memory 7.94 GB
    Available Virtual Memory 6.25 GB
    Page File Space 6.00 GB
    Page File C:\pagefile.sys
  2. Was the x2 cpu put in after windows was originally installed on a single core or was it installed with the x2 cpu?
  3. no it was a fresh install on a newly built system.
  4. Try reseating the cpu. It's also possible one core is bad.
    In task manager how many cpu graphs are there?
  5. only one graph shows in task manager. yeah i was hoping it wasnt a bad core but it looks that way. il ask him to reseat the cpu later when i talk to him. is their anything else that could be wrong?
  6. quick update, we have updated the MB chipset drivers and bios and no change.
    also a friend commented on the bad core theory and suggested its not possible because the chip would fail at POST if it was gone bad. i dont know if thats true(im a novice at this) anyone got any thoughts on this?
  7. also found this if its any help
    guy having the EXACT same problem
  8. I had the same problem. I disabled cool n quiet in the BIOS based on someone's suggestion, and when I restarted it showed 2 logical cores in the task manager!! Computer runs much faster also! Thanks for the help.
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