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Topic Title: 1055T Six Core become Five
Topic Summary: AMD Phenom™ Troubleshooting
Created On: 08/19/2010 01:50 AM
Status: Read Only
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 08/19/2010 01:50 AM
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Joined: 08/18/2010

Three weeks ago I built a new computer with the following spec. It was running smooth and pass all those benchmark tests in very stable condition. I can see all 6 cores in both BIOS startup screen and Win7 Task-manager.

CPU: AMD 1055T @2.8GHz
RAM: Kingston 4 x 2GB DDR-3 1333
MOBO: Asrock 890GX Extreme 3 (Lastest BIOS: 2.40)
Optical Drive: LG DVD/Blu-Ray Combo
HDD: WD (Black) 1TB + Hitachi 2TB
Display Card: Zotac GTX460 1GB
TV Card: Magic Pro PoHDTV Delux

PSU: Antec TPN-650

Windows 7 Home Premium 64-bit

Last night I spotted out that the Task Manager showed 5 cores only (i.e. one core was disappeared). Then I also confirmed the 5-core issue with CPU-Z and AMD Overdrive.

I restarted the computer, BIOS startup screen showed core counting of 6, but still the Win7 Taskmanager reporting of 5 cores only. Load BIOS DEFAULT, re-flash the BIOS, remain the same (i.e. showing 5 cores count in Win7 but 6 core in BIOS).

Any suggestion to the BIOS setting or alternative suggestion to fix it? Thanks

P.S. This computer has never been overclocked and most settings in the BIOS was [AUTO].

Edited: 08/19/2010 at 03:47 AM by vollertam
 08/19/2010 03:21 PM
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Try going into Bios and setting the CPU unlocker from Auto to manual then turn on every core and see if that works.
 08/19/2010 04:45 PM
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Sub Zero

Posts: 2246
Joined: 05/17/2008

Hi vollertam , type in msconfig and pin to start menu , open it up click boot then click advanced options then number of processors put 6 then re-boot your pc . Try this .

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