I7 only using 1 core

[dmce_mason]

I have a nice gaming rig that i just built last month and that has been running well untill recently. I have an Intel Core i7-2600k (OC @ 4.0 GHZ). The processor is only using one core no matter what i'm doing, Running starcraft i only get 15 FPS with crossfired 6950's when core 1 is at 100% core 2 @ 0% (Absolutly no graph in task manager) Core 3 @ 10-20% and core 4 again at 0%. I dont see what the problem is, I have not changed any settings in the lst week that would have caused this to happen.

Heres a pic of the task manager at idle, Looks the same except core 1 is all the way at the top after playing a game of SCII: http://dangermce.webs.com/apps/photos/photo?photoid=138623441

 

[AdrianPerry]

Go into your BIOS and enable the rest of the cores. I'm not sure how its managed to be disabled because I'm pretty sure it doesn't come like that as default. I presume when you overclocked you only selected it to overclock one core thus disabling the other 3.

Standard BIOS: (see "CPU Cores Enabled") http://lh4.ggpht.com/_9g2xyiIBsNU/TDTuNn41MwI/AAAAAAAAAHw/ScMps1bCh8U/BIOS_Advanced_CPU_Core_Features.jpg

UEFI BIOS: (see "Active Processor Cores") http://www.legitreviews.com/images/reviews/1615/asus-p8z68-v-pro-bios-8.jpg

 

[alyoshka]

I think that is what the new Turbo Boost technology is all about.
It gives you turbo by idling other core and higher speeds of just a few cores.
I could be wrong, but, I think that is what I understood by all the jargon they used when they pumped out the new processors.
You could try disabling the Turbo Boost tech and then check the load on all the cores while playing SC.

 

[AdrianPerry]

I think that is what the new Turbo Boost technology is all about.
It gives you turbo by idling other core and higher speeds of just a few cores.
I could be wrong, but, I think that is what I understood by all the jargon they used when they pumped out the new processors.
You could try disabling the Turbo Boost tech and then check the load on all the cores while playing SC.

I thought the turbo was just like a "gimiky over-clock" so basically when CPU performance hit quite a high level, it would temporarily over-clock itself to 3.7GHz to allow extra performance. I didn't realise it disabled cores?

EDIT:

Ooops maybe your right. The example listed in this wiki article seems to support what you said: http://en.wikipedia.org/wiki/Intel_Turbo_Boost

In which case, yes, disable the turbo and you *SHOULD* be ok.

 

[amdfangirl]

It's Starcraft 1.

Single threaded.

 

[AdrianPerry]

It's Starcraft 1.

Single threaded.

He said SCII in his OP?.....

Just shows how much bottleneck a single core gives to Crossfire 6950's haha! 15fps :/

 

[lp231]

I don't get that no graphic in task manager. Do you mean when you open up task manager you only see a single graph or is it 4 graphs, but only the 1st graph is active while the rest are idle?

If you see just a single graph in task manger, then it has something to do with your ACPI drivers. The ACPI driver should say "multiprocessor" along those lines.
If it does not they will only use a single core.
Select update driver and manually select from list. Select the "multiprocessor" ACPI driver and install it. After that restart and you should see 4 CPU graphs in task manager.

edit
Oh so that graphic is OP's task manager pic? I thought it was some website explaining task manager...
You can run some benchmark to check if all other cores are working like CineBench?

 

[alyoshka]

I don't get that no graphic in task manager. Do you mean when you open up task manager you only see a single graph or is it 4 graphs, but only the 1st graph is active while the rest are idle?

If you see just a single graph in task manger, then it has something to do with your ACPI drivers. The ACPI driver should say "multiprocessor" along those lines.
If it does not they will only use a single core.
Select update driver and manually select from list. Select the "multiprocessor" ACPI driver and install it. After that restart and you should see 4 CPU graphs in task manager.

Check his screenshot first. It's very Clear there.