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Pentium D
The Pentium D〔(【引用サイトリンク】url=http://www.tomshardware.com/2005/04/05/the_pentium_d/ )〕 brand refers to two series of desktop dual-core 64-bit x86-64 microprocessors with the NetBurst microarchitecture, which is the dual-core variant of Pentium 4 "Prescott" manufactured by Intel. Each CPU comprised two dies, each containing a single core, residing next to each other on a multi-chip module package. The brand's first processor, codenamed Smithfield, was released by Intel on May 25, 2005. Nine months later, Intel introduced its successor, codenamed Presler,〔(【引用サイトリンク】url=http://www.tomshardware.com/2006/01/05/the_65_nm_pentium_d_900s_coming_out_party/page6.html )〕 but without offering significant upgrades in design,〔(【引用サイトリンク】url=http://www.tomshardware.com/2006/01/05/the_65_nm_pentium_d_900s_coming_out_party/index.html )〕 still resulting in relatively high power consumption.〔(【引用サイトリンク】url=http://www.tomshardware.com/2006/01/05/the_65_nm_pentium_d_900s_coming_out_party/page5.html )〕 By 2004, the NetBurst processors reached a clock speed barrier at 3.8 GHz due to a thermal (and power) limit exemplified by the ''Presler's'' 130 watt thermal design power〔 (a higher TDP requires additional cooling that can be prohibitively noisy or expensive). The future belonged to more energy efficient and slower clocked dual-core CPUs on a single die instead of two.〔(【引用サイトリンク】url=http://www.tomshardware.com/2005/10/10/intel_moves_from_dual_core_to_double_core/ )〕 The final shipment date of the dual die ''Presler'' chips was August 8, 2008,〔(【引用サイトリンク】url=http://www.tgdaily.com/content/view/33351/135/ )〕 which marked the end of the Pentium D brand and also the NetBurst microarchitecture.
==Pentium D/Extreme Edition==
The dual-core CPU is capable of running multi-threaded applications typical in transcoding of audio and video, compressing, photo and video editing and rendering, and ray-tracing. Single-threaded applications, including most older games, do not benefit much from a second core compared to an equally clocked single-core CPU. Nevertheless, the dual-core CPU is useful to run both the client and server processes of a game without noticeable lag in either thread, as each instance could be running on a different core. Furthermore, multi-threaded games benefit from dual-core CPUs.
In 2008, many business applications were not optimized for multiple cores. They ran at similar speed when not multitasking on the Pentium D or older Pentium 4 branded CPUs at the same clock speed. However, in multitasking environments such as BSD, Linux, Microsoft Windows operating systems, other processes are often running at the same time; if they require significant CPU time, each core of the Pentium D branded processor can handle different programs, improving overall processing speed over its single-core Pentium 4 counterpart.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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