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The transistor count is the number of transistors on a an integrated circuit chip. Transistor count is the most common measure of semiconductor integrated circuit complexity. , the highest transistor count in a commercially available CPU (in one chip) is over 5.5 billion transistors, in Intel's 18-core Xeon Haswell-EP. According to Moore's Law, the transistor count of the integrated circuits doubles approximately every two years. On most modern microprocessors, the majority of transistors are contained in caches. In fact, IBM's Storage Controller at 7.1 billion transistors with 480 MB L4 cache in 2015, is bigger than any microprocessor before, on both counts; it is however not a CPU until combined with one (or more) of its companion IBM z13 microprocessor chip. That chip holds the rest of the cache, 64 MB L3 (and the other smaller levels) and processor logic, and while having the same dimensions has only 3.9 billion transistors (near record breaking for a microprocessor on its own). To date, combined, this mainframe is the biggest general purpose processor when only one Storage Controller is used, let alone when two are used. On August 7, 2014, IBM announced their neuromorphic TrueNorth chip; their second generation chip backed by the SyNAPSE program, which, with 5.4 billion transistors (in 4096 cores), has more transistors than any chip IBM has ever made (until their Storage Controller, mentioned above) and is the "second largest (CMOS) chip in the world"〔http://www.extremetech.com/extreme/187612-ibm-cracks-open-a-new-era-of-computing-with-brain-like-chip-4096-cores-1-million-neurons-5-4-billion-transistors〕〔 ("SyNAPSE program develops advanced brain-inspired chip" ). August 7, 2014. 〕 (and therefore the largest "neuromorphic" one, as a GPU chip is bigger, but sixteen can be connected together). Xilinx currently holds the "world-record" for a FPGA containing more than 20 billion transistors. == Microprocessors == A microprocessor incorporates the functions of a computer's central processing unit on a single integrated circuit. It is a multipurpose, programmable device that accepts digital data as input, processes it according to instructions stored in its memory, and provides results as output. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Transistor count」の詳細全文を読む スポンサード リンク
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