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The P5 Pentium was the first superscalar x86 processor; the Nx586, P6 Pentium Pro and AMD K5 were among the first designs which decode x86-instructions asynchronously into dynamic microcode-like micro-op sequences prior to actual execution on a superscalar microarchitecture; this opened up for dynamic scheduling of buffered partial instructions ...
P5 (Pentium) 1993 5 Superscalar P6 (Pentium Pro) 14 Speculative execution, register renaming, superscalar design with out-of-order execution P6 14 [4] Branch prediction: P6 (Pentium III) 1995 14 [4] Intel Itanium "Merced" 2001 Single core, L3 cache Intel Itanium 2 "McKinley" 2002 11 [5]
The Pentium (also referred to as the i586 or P5 Pentium) is a microprocessor introduced by Intel on March 22, 1993. It is the first CPU using the Pentium brand. [3] [4] Considered the fifth generation in the x86 (8086) compatible line of processors, [5] succeeding the i486, its implementation and microarchitecture was internally called P5.
Intel's second generation of 32-bit x86 processors, introduced built-in floating point unit (FPU), 8 KB on-chip L1 cache, and pipelining. Faster per MHz than the 386. Small number of new instructions. P5 original Pentium microprocessors, first x86 processor with super-scalar architecture and branch prediction. P6
NetBurst-based processors were simply not as efficient per clock or per watt compared to their P6 predecessors. Mobile Pentium 4 processors ran much hotter than Pentium III-M processors without significant performance advantages. Its inefficiency affected not only the cooling system complexity, but also the all-important battery life.
A later variation of the K6 CPU, K6-2, added floating-point-based SIMD instructions, called 3DNow!. The K6 was originally launched in April 1997, running at speeds of 166 and 200 MHz. It was followed by a 233 MHz version later in 1997. Initially, the AMD K6 processors used a Pentium II-based performance rating (PR2) to designate their speed. [3]
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