My pc has 8 cores but only 4 are showing

Darbz

Distinguished
Oct 4, 2011
3
0
18,510
I have one of those gadgets on my side bar which only shows 4 cores but it has previously showed 8. Im running windows vista and have 2 quad core 2.ghz chips. Device manager sees all the cores and lists them as fine and working properly. When i view them in task manager and performance monitor they too only show 4. Why is there not 8 showing??
 

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