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Hyperthread and Hypertransport


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It just works. It's the interconnect for some motherboard components, and can't be turned off in the BIOS. The "other" HT is Intel's Hyperthreading which is switched on/off in the BIOS. It allows greater thread-level parallelism, which means that the CPU can run more threads at a time (Task Manager will show 2 CPUs instaed of 1 on a single-CPU system), although the 2nd "CPU" is much slower. Our mental ray tests show a 15-20% boost, but it depends on your scene. Hypertransport will be in the next nVidia chipset for Intel(!), and will be the first time both HTs will be in one PC. I wonder how the marketing guys will resolve this?

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