Hyper-Threading Technology (HTT) is Intel's term for their implementation of simultaneous multithreading technology (SMT) used with the Pentium 4. The theory is to place two logical processors into a single CPU die allowing multiple threads to run simultaneously. A single processor supporting Hyper-Threading Technology presents itself to supporting operating systems and applications as two virtual processors. This allows a single Pentium 4 processor to function as two virtual or logical processors but will not achieve the same level of performance as 2 separate processors. This allows the processor to take advantage of resources that otherwise would sit idle, and get more work done in the same amount of time.
Multithreading capability is built in to operating systems such as Windows 2000, XP and Linux. Intel claims up to a 30 percent gain in performance. Performance gains vary with certain applications and some programs may actually slow down. Hyper-Threading Technology requires a computer with an Intel Pentium 4 processor supporting Hyper-Threading Technology and a Hyper-Threading Technology enabled chipset, BIOS and operating system. Current Pentium 4 Processors use Hyper-Threading, but the next-generation cores such as the Merom, Conroe and Woodcrest will not.
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