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On the intel website, it says that the i5 processor uses hyper threading. Elsewhere on the internet I've read various conflicting reports. Can anyone give me a definitive answer?

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It does not.

In this 2011 iMac unboxing, the processor is an 2500-S, and according to Intel itself, this model does not support it.

enter image description here

Here's the info from Intel itself:

enter image description here

Basically, the desktop i5's don't support Hyper Threading. This is also explained in this and several subsequent reports from MacWorld on the 2011 iMac.

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Here is a useful page on the Intel site showing all Desktop i5's and if they support HT or not. –  HaydnWVN Nov 24 '11 at 10:04
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Also a good resource, thanks for sharing @HaydnWVN –  slhck Nov 24 '11 at 10:45
    
Right. Thanks for that, i7 it is then. –  savagent Nov 24 '11 at 22:34

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