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Pentium II
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{{Short description|Intel microprocessor}} {{Use mdy dates|date=October 2019}} {{Infobox CPU | name = Intel Pentium II | image = Pentium_II_original_case_badge.png | caption = Original Pentium II MMX case badge | produced-start = {{Start date and age|1997|05|07}} | produced-end = {{End date and age|2003|12|26}} (all, including embedded units)<ref name="embdiscontinued">{{cite web |url=http://developer.intel.com/design/pcn/Processors/D0102659.pdf |title=Product Change Notification #102659-02|date=August 14, 2002 |publisher=Intel|archive-url=https://web.archive.org/web/20030320150351/http://developer.intel.com/design/pcn/Processors/D0102659.pdf |archive-date=March 20, 2003|url-status=dead|access-date=October 14, 2019}}</ref><br>{{End date and age|2005|01|01}} (discontinuation and end of life) | slowest = 233 | slow-unit = MHz | fastest = 450 | fast-unit = MHz | fsb-slowest = 66 | fsb-slow-unit = MT/s | fsb-fastest = 100 | fsb-fast-unit = MT/s | manuf1 = Intel | core1 = Klamath (desktop) | core2 = Deschutes (desktop) | core3 = Tonga (mobile) | core4 = Dixon (mobile) | size-from = 350 nm | size-to = 180 nm | arch = [[IA-32]] | microarch = [[P6 (microarchitecture)|P6]] | sock1 = [[Slot 1]] | sock2 = [[MMC-1]] | sock3 = [[MMC-2]] | sock4 = [[Mini-Cartridge]] | sock5 = PPGA-B615 ([[Micro-PGA1|ΞΌPGA1]]) | numcores = 1 | predecessor = [[Pentium (original)|Pentium]], [[Pentium Pro]], [[Pentium MMX]] | successor = [[Pentium III]] (SSE successor), [[Celeron]], [[Pentium 4]] (SSE2 successor) | extensions = [[MMX (instruction set)|MMX]], [[Physical Address Extension|PAE]] | support status = Unsupported |soldby=Intel|designfirm=Intel|cpuid=Klamath: 80522<br/>Deschutes and Tonga: 80523<br/>Dixon: 80524|l1cache=32 KB (16 KB data + 16 KB instructions)|l2cache=256β512 KB|transistors1='''Klamath''': 7.5 million|transistors3='''Tonga''': 7.5 million|transistors2='''Deschutes''': 7.5 million|transistors4='''Dixon''': 27.4 million}} [[Image:Pentium II.jpg|thumb|right|upright=1.2|Pentium II processor with MMX technology, [[Slot 1|SECC cartridge]].]] The '''Pentium II'''<ref>{{cite web |title=Microprocessor Hall of Fame |url=http://www.intel.com/museum/online/hist%5Fmicro/hof/ |publisher=Intel |access-date=2007-08-11 |archive-url = https://web.archive.org/web/20070706032836/http://www.intel.com/museum/online/hist_micro/hof/ <!-- Bot retrieved archive --> |archive-date = 2007-07-06}}</ref> is a brand of sixth-generation [[Intel]] [[x86]] [[microprocessor]]s based on the [[P6 (microarchitecture)|P6]] [[microarchitecture]], introduced on May 7, 1997. It combined the ''P6'' microarchitecture seen on the [[Pentium Pro]] with the [[MMX (instruction set)|MMX instruction set]] of the [[Pentium MMX]], and is the second processor using the [[Pentium (brand)|Pentium]] brand. Containing 7.5 million [[transistor]]s (27.4 million in the case of the mobile Dixon with 256 [[Kilobyte|KB]] on-die [[CPU Cache|L2 cache]]), the Pentium II featured an improved version of the first ''P6''-generation core of the Pentium Pro, which contained 5.5 million transistors. However, its L2 cache subsystem was a downgrade when compared to the Pentium Pro's. In 1998, Intel stratified the Pentium II family by releasing the Pentium II-based [[Celeron]] line of processors for low-end computers and the Intel [[Pentium II Xeon]] line for servers and workstations. The Celeron was characterized by a reduced or omitted (in some cases present but disabled) on-die full-speed L2 cache and a 66 MT/s FSB. The Xeon was characterized by a range of full-speed L2 cache (from 512 KB to 2048 KB), a 100 MT/s FSB, a different physical interface ([[Slot 2]]), and support for [[symmetric multiprocessing]]. In February 1999, the Pentium II was replaced by the nearly identical [[Pentium III]], which only added the then-new [[Streaming SIMD Extensions|SSE]] instruction set. However, the older family would continue to be produced until June 2001 for desktop units,<ref>{{cite web |date=January 14, 2000 |url=http://developer.intel.com/design/pcn/Processors/D0000896.pdf |title=Product Change Notification #896|publisher=Intel |archive-url=https://web.archive.org/web/20000930070424/http://developer.intel.com/design/pcn/Processors/D0000896.pdf|archive-date=September 30, 2000 |url-status=dead|access-date=October 14, 2019}}</ref> September 2001 for mobile units,<ref>{{cite web |date=March 13, 2000 |url=http://developer.intel.com/design/pcn/Processors/D0000954.pdf |title=Product Change Notification #954 |publisher=Intel |archive-url=https://web.archive.org/web/20000815204044/http://developer.intel.com/design/pcn/Processors/D0000954.pdf |archive-date=August 15, 2000 |url-status=dead|access-date=October 14, 2019}}</ref> and the end of 2003 for embedded devices.<ref name="embdiscontinued"/> Intel officially declared end-of-life and discontinued Pentium II processors on January 1, 2005.
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