4 core to 3 core?

[mcb99]

I have a AMD phenom II 945 quad core processor. For the past year or so, when i boot up i see the display that says 4 cores are active...now for some reason i see 3 cores are active...What happened? can it be put back? any programs that anyone knows of?

wind 7 64
amd phenom II 945
asus m4a79t deluxe

 

[Motopsychojdn]

what does the tab in task manager say? three or four?
it may be that one cores died but you'll have to have several indicators that say you only have three cores,
Moto

 

[mcb99]

in the task manager it says cpu0 cpu1 cpu2

 

[geekapproved]

in the task manager it says cpu0 cpu1 cpu2

I have a feeling he doesn't know what task manager is because task manager doesn't say cpu anything. It just shows graphs.

 

[Max Collodi]

I have a feeling he doesn't know what task manager is because task manager doesn't say cpu anything. It just shows graphs.

If you open the Resource Monitor window in Task Manager they are numbered.

 

[green300]

Sounds like ACC maybe enabled for some reason. Pretty sure the splash screen should read something like "press 4 to activate all cores" if ACC is disabled, and when enabled it tells you how many cores are active 4,3,2.., even on a native x4.

Make sure Advanced Clock Calibration is disabled in your bios. page 3-18 in your manual

Go to Advanced/CPU Configuration/ and make sure "Advanced Clock Calibration" is "disabled".

If that doesn't help try clearing the cmos,page 2-20 of your manual.

g'l

 

[mcb99]

Best answer selected by mcb99.