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here's what my system is: intel C2D E6600 processor
                                       nforce 680i sli mobo (EVGA 122-CK-NF68)

                                        patriot DDR2 2x1GB pc2-6400 800mhz
                                        nvidia geforce 8800 GTS

                                    Operating System :    Microsoft

Windows XP Home Edition 5.01.2600 Service Pack 2

                                         pwr supply: OCZGXS700


tried alot to get both cores to run.  ive tried  reloading windows and

forcing the HAL to both ACPI multiprocessor PC,  and advanced

configuration and power interface (ACPI) PC thats i tried both

istalling it over the current version of windows and that did not work

so i formatted my hard drive fresh installed XP so now in device

manager it has advanced configuration and power interface (ACPI) PC

under the the computer tree but still it only reads 1 core in task

manager also in cpu-z  in the selection box on the cpu tab processor #1

is gray and cores is 1 and threads is 1.  and in my BIOS in the place

where it shows the cores it only shows 1 enabled but i cant access the

others to enable the second core. I have updated my BIOS but still

nothing.  please help. 

CPU-Z 1.40.5 report file


Number of processors1

Number of cores2 per processor

Number of threads1 (max 2) per processor

NameIntel Core 2 Duo E6600

Code NameConroe

SpecificationIntel(R) Core(TM)2 CPU 6600 @ 2.40GHz

PackageSocket 775 LGA


Extended Family/Model6.F

Core SteppingB2

Technology65 nm

Core Speed2399.9 MHz

Multiplier x Bus speed9.0 x 266.7 MHz

Rated Bus speed1066.6 MHz

Stock frequency2400 MHz

Instruction setsMMX, SSE, SSE2, SSE3, SSSE3, EM64T

L1 Data cache2 x 32 KBytes, 8-way set associative, 64-byte line size

L1 Instruction cache2 x 32 KBytes, 8-way set associative, 64-byte line size

L2 cache4096 KBytes, 16-way set associative, 64-byte line size

Chipset & Memory 

NorthbridgeNVIDIA nForce 680i SLI SPP rev. A2

SouthbridgeNVIDIA 680i SLI MCP rev. A2

Graphic InterfacePCI-Express

PCI-E Link Widthx16

PCI-E Max Link Widthx16

Memory TypeDDR2

Memory Size2048 MBytes

Memory Frequency400.0 MHz (2:3)

CAS# Latency (tCL)5.0 clocks

RAS# to CAS# (tRDC)5 clocks

RAS# Precharge (tRP)5 clocks

Cycle Time (tRAS)16 clocks

Bank Cycle Time (tRC)21 clocks

Command Rate2T


System ManufacturerEVGA

System Name122-CK-NF68

System S/N1

Mainboard VendorEVGA

Mainboard Model122-CK-NF68

BIOS VendorP[censored]nix Technologies, LTD

BIOS Version6.00 PG

BIOS Date07/11/2007

Memory SPD 

Module 1DDR2, PC2-6400 (400 MHz), 1024 MBytes, PDP Systems

Module 2DDR2, PC2-6400 (400 MHz), 1024 MBytes, PDP Systems


Windows VersionMicrosoft Windows XP Home Edition Service Pack 2 (Build 2600)

DirectX Version9.0c