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    With HT enabled you can have 16 threads ;) Commented Jun 27, 2011 at 14:15
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    those aren't real threads they are pretend threads on an Intel box, and you don't get 1:1 performance with Hyper Threading and in some cases you get less performance with all the context switching and cache misses that Hyper Threading causes. Commented Jun 27, 2011 at 14:22
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    In all fairness, the same applies to streams. A stream processor can only run one instruction at a time, so unless all streams are trying to execute the same instruction some streams will be idle, and therefore you usually don't get 1:1 performance on GPU's either. Commented Jun 27, 2011 at 14:26
  • An which ones are these tasks? When should I say: hey, I rather use my GPU than my processor? Commented Jun 27, 2011 at 14:28
  • @MSalters notice my qualifier of "...the tasks it is very good at..." And yes you do get 1:1 performance on appropriate tasks. A 512 stream GPU encoding video will be 2X as faster as a 256 stream GPU running the same code on the same input. Commented Jun 27, 2011 at 14:34