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Q6600 Only sees two cores

Last response: in CPUs
December 11, 2008 7:15:33 PM

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

More about : q6600 sees cores

December 11, 2008 7:35:10 PM

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

Related resources
December 11, 2008 7:37:17 PM

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.
December 11, 2008 7:39:27 PM

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.
a b à CPUs
December 11, 2008 8:01:32 PM

Vista should automatically install the Quad Core Driver.
a c 203 à CPUs
December 11, 2008 8:28:35 PM

Check with the MSI website for MSI 680i motherboard & Q6600 issues and a possible BIOS update.
December 11, 2008 9:40:45 PM

I have read somewhere that some have success, uninstalling ACPI in device manager and rebooting...