The correct number of Processor cores is not recognized correctly in a Microsoft Windows based system after a processor upgrade

Article Number: CPU-9

 

​Issue Description:
The processer was recently upgraded to one with more cores, but the or​iginal Microsoft Windows installation was kept. In the Microsoft Window’s Device Manager / Task Manager, the correct number of processor cores is not shown.

Troubleshooting:
The following troubleshooting suggestions can help resolve processor misidentification issues that occur after a processor upgrade.

Table of Contents


Check for processor and motherboard compatibility:
If the processor was released after the motherboard, the motherboard’s BIOS version may not support the processor. Refer to the motherboard’s manual or manufacturer’s website for an up-to-date processor support listing for the motherboard.

  • Verify that the motherboard’s BIOS version supports the model and version of the processor
  • Download and install any necessary BIOS updates
  • If the motherboard must be replaced, choose one of the AMD Processors – Recommended Motherboards for the processor

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Check for processor and operating system compatibility:
Depending on the Windows version used, multiple cores may not be recognized if the operating system does not have the proper licensing. Refer to the operating system developer to ensure compatibility between the operating system and processor

  • Verify that the operating system supports the amount of processor cores installed in the system
  • Verify that the operating system has the proper service pack and Windows updates installed
  • Microsoft provide information on Multicore Processor Licensing

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Ensure enough wattage is provided by the power supply:
An insufficient power supply can prevent the system from booting.

  • To ensure the power supply wattage is sufficient for the system, add up the wattage requirements of each hardware component.
  • Confirm that the wattage output of the power supply is greater than the system’s overall wattage requirements.
  • To view the wattage requirements of the processor, refer to AMD Compare

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Verify proper configuration of the processor:
Ensure the motherboard’s BIOS and operating system both recognize the processors model and speed correctly

  • Most motherboards automatically detect the type of processor installed and configure its BIOS settings accordingly.
    • If not, refer to the motherboard’s manual for instructions on how to properly configure the processor in the BIOS
  • Reinstall the “Computer” driver in Device Manager of the Windows operating system
    • Note! This should be performed regardless if the current driver is the most current driver available
    • For instructions on how to reinstall the “Computer“ driver,  contact the operating system developer
    • Microsoft provides information on Installation and Driver Signing
  • A complete reinstall of the operating system may be required
    • Note! This procedure will erase all data on the hard drive. Back up all personal data before attempting to reinstall the operating system
    • For instructions on how to reinstall the operating system, contact the operating system developer
    • Microsoft provides information on Windows Help & How-to

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Verify functionality of the processor:
To ensure the new processor is functioning properly, try one of the following:

  • Test 1: Test the new processor in another system that is known to be compatible with the processor
    • If the system boots, the problem may be related to other hardware components
      • Other components that can prevent the system from booting are the power supply, motherboard, memory, graphics card and hard drive
      • Contact each device manufacturer for further troubleshooting
    • If the system does not boot, the problem may be related to the processor
      • Check the processor for any damage (bent pins, burn marks, pin discoloration)
      • To obtain warranty service for your AMD Processor in a Box, contact your computer system manufacturer or distributor during the systems warranty period. After your computer system warranty has expired, you can submit a warranty request to AMD Customer Care
  • Test 2: Reinstall the old processor in the system to determine if the system will boot
    • If the system boots, the problem may be related to the processor
      • Check the processor for any damage (bent pins, burn marks, pin discoloration)
      • To obtain warranty service for your AMD Processor in a Box, contact your computer system manufacturer or distributor during the systems warranty period. After your computer system warranty has expired, you can submit a warranty request to AMD Customer Care
    • If the system does not boot, the problem may be related to other hardware components
      • Other components that can prevent the system from booting are the power supply, motherboard, memory, graphics card and hard drive
      • Contact each device manufacturer for further troubleshooting

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Footnotes