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Quad core not running to full potential?

I have a quad core AMD athlon X4 750k but i go into my task manager and it says 2 cores and 4 logical processors. I am a amatuer at these things but any explanation would help.
Reply to michael_705
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    The reason it shows up that way is because AMD's quad core CPUs sortof aren't quite full quad cores - the cores have to share resources, so when you're using all 4 of them, you only get something like 3.3-3.6x the performance of one core. The cores are grouped into "modules", each with two cores, and your CPU has two modules.

    I don't think it's unfair to call it a quad, but Windows looks at it the same way it looks at an Intel dual core with hyperthreading, because it has to schedule tasks in a similar way, so as not to put two things on the same module when it can be avoided.
    Reply to Ecky
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