hackapelite

That part is incorrect... HT doesn't make multiple instructions execute simultaneously on the same clock cycle. It works more like this: there are two logical threads (#1 and #2) both use the same execution core, and both can (and do) have stuff running on them...now, when thread #1 stalls for reason or another (branch prediction mistake, dependency hazard, etc.), it lets thread #2 to take over the execution core instead of letting it sit idle, so whatever program is running on that thread will continue to execute, instead of having all processes stall which is what would happen on a non-HT CPU... and if #2 stalls it lets #1 to kick back in... this is kinda crappy explanation, I know, but since you seem to understand HT fairly well I assume you get this

I'll try to summarize this... it doesn't make multiple instructions run on the same clock cycle, it lets the CPU to execute instructions from other processes when the current process stalls (makes sense? if not, forget about my summary...)

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