One of the CPU disappeared !!!

Hi,
As many of us I guess, I'm using IStat Pro to monitor my macbook (temperatures etc.) and it seemed since 2/3 months I have CPU A still apprearing, but not the CPU B !
My mac started to be a bit slow around the same period so I wonder if one of the core does not work anymore !!!
Is there any other way i can check with an internal application (ie: mac internal system application) if both of the CPU are working ?
Thanks
Y

It's the new Intel i7 machines that have "virtual" cores.
The virtual cores are yet another version of Hyperthreading, hopefully better implemented then last time around.
HT is not good for programs that operate in real-time, specifically, Logic Audio. Performance tests show Logic running more efficiently when Hyperthreading is shut of via the terminal.
pancenter-

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