Need some core i7 help please!

[sacmo]

Hey guys well i got a 920 and well i overclocked it at a stable 4 ghz, well i decided to go back to stock cuase i jsut wanted to see if i could reach 4ghz.


well today i went back to stock, and now im getting Proformance spikes in the 1st core when playing left 4 dead or any game online.


The thing i find wierd, is that when playing any game in single player mode the cores run fine just like they used to run, anyone know of a fix for this issue ?

 

[sacmo]

UPDATE:

So i was running css in windowed mode and i was watching task manger and core 0 was running at 99% while the rest of the cores barley used 1% is there some kinda fix for this issue that u all know of ?

 

[cjl]

What process was using the CPU power?