Q6600 Only sees two cores

I have a Q6600 and I realized it only shows two cores that are working. I went to task manager and click the performance tab and it only has two windows for the cores. However I go to device manager and it states I have four cores. How can I get the other two cores to work? I have p6n MSI Diamond board. Nothing is overclocked or anything. It states that I do have a q6600 cpu though. I am using windows vista ultimate 64 bit
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More about q6600 sees cores
  1. Use CPU-Z to pull up the CPU data: http://www.cpuid.com/cpuz.php
  2. CPU-Z 1.49 report file


    Number of processors 1
    Number of cores 2 per processor
    Number of threads 2 per processor
    Name Intel Core 2 Quad Q6600
    Code Name Kentsfield
    Specification Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz
    Package Socket 775 LGA
    Family/Model/Stepping 6.F.B
    Extended Family/Model 6.F
    Core Stepping G0
    Technology 65 nm
    Core Speed 2400.0 MHz
    Multiplier x Bus speed 9.0 x 266.7 MHz
    Rated Bus speed 1066.7 MHz
    Stock frequency 2400 MHz
    Instruction sets MMX, SSE, SSE2, SSE3, SSSE3, EM64T
    L1 Data cache (per processor) 2 x 32 KBytes, 8-way set associative, 64-byte line size
    L1 Instruction cache (per processor) 2 x 32 KBytes, 8-way set associative, 64-byte line size
    L2 cache (per processor) 4096 KBytes, 16-way set associative, 64-byte line size

    Chipset & Memory

    Northbridge NVIDIA nForce 680i SLI SPP rev. A2
    Southbridge NVIDIA nForce 680i SLI MCP rev. A2
    Graphic Interface PCI-Express
    PCI-E Link Width x8
    PCI-E Max Link Width x16
    Memory Type DDR2
    Memory Size 7168 MBytes
    Memory Frequency 333.3 MHz (4:5)
    CAS# Latency (tCL) 5.0 clocks
    RAS# to CAS# (tRCD) 5 clocks
    RAS# Precharge (tRP) 5 clocks
    Cycle Time (tRAS) 15 clocks
    Bank Cycle Time (tRC) 20 clocks
    Command Rate (CR) 1T


    System Manufacturer MSI
    System Name MS-7320
    System S/N To Be Filled By O.E.M.
    Mainboard Vendor MSI
    Mainboard Model MS-7320
    BIOS Vendor American Megatrends Inc.
    BIOS Version V1.3
    BIOS Date 11/02/2007

    Memory SPD

    Module 1 DDR2, PC2-6400 (400 MHz), 2048 MBytes, OCZ
    Module 2 DDR2, PC2-5300 (333 MHz), 2048 MBytes, Corsair
    Module 3 DDR2, PC2-6400 (400 MHz), 2048 MBytes, Samsung
    Module 4 DDR2, PC2-6400 (400 MHz), 1024 MBytes, OCZ


    Windows Version Microsoft Windows Vista (6.0) Ultimate Edition Service Pack 1 (Build 6001)
    DirectX Version 10.0
  3. several motherboards have options to turn cores on or off. i don't know if your exact board has that, but it be a good place to start.

    if the board has it it would be in the bios.

    try that out and i hope this helps.
  4. What he said

    ALSO 2 things.

    1. Did you use to have a 2 core CPU and you just put in the Q6600 with out ding a reinstall of Windows? Sometimes that causes it..

    IF all else is ok then i would def RMA the chip due to it being defective.
  5. Vista should automatically install the Quad Core Driver.
  6. Check with the MSI website for MSI 680i motherboard & Q6600 issues and a possible BIOS update.
  7. I have read somewhere that some have success, uninstalling ACPI in device manager and rebooting...
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