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The hyper threading is a technology implemented by Intel in the latest Pentium IV, Xeon, Itanium 2 and Intel-Core and Intel Core 2. It allows to perform two routines (Thread) at the same time (SMT) of a single programme or two different programs. The Hyper-Threading creates two logical processors in the same microprocessor. Each logical processor shares the capabilities of internal architecture, cache memory and system bus. The system behaves as a multiprocessor. Its use requires a processor, chipset, OS and software compatible. Incorporates Dual-Core it two processors in the same circuit.
The benefit is related to the use of the internal resources of the current processors that use several arithmetic units in parallel (in another). Each routine is dissociated into small suites of instructions, called Thread. Each Tread using one or the other of the calculation units, the use of internal resources is maximized. Only the Pentium IV 3.06 Ghz (Northwood core) and Prescott core include this feature. The associated chipset must be minimum an i845E. For Xeon, Xeon MP processors and next (nocona) include it. However, this technology is not present in the Intel Core and Core 2 Duo, but reintroduce in i5 and I7 processors.
For Windows's licences, Windows 2000 manages processors with hyperthreading as 2 separate processors (CPU) in Symmetric Multiprocessing (SMP) mode. For example, Windows 2000 standard (maximum 2 processors) agrees with only one using this function. This is not the case for versions of Windows XP (including XP Home) that properly manage this function and recognize a single processor. Previous versions do not accept the multiprocessor: it must be disabled in the Bios.
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