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Pentium




<processor> Intel's superscalar successor to the 486. It has two 32-bit 486-type integer pipelines with dependency checking.

It can execute a maximum of two instructions per cycle.

It does pipelined floating-point and performs branch prediction.

It has 16 kilobytes of on-chip cache, a 64-bit memory interface, 8 32-bit general-purpose registers and 8 80-bit floating-point registers.

It is built from 3.1 million transistors on a 262.4 mm^2 die with ~2.3 million transistors in the core logic.

Its clock rate is 66MHz, heat dissipation is 16W, integer performance is 64.5 SPECint92, floating-point performance 56.9 SPECfp92.

It is called "Pentium" because it is the fifth in the 80x86 line.

It would have been called the 80586 had a US court not ruled that you can't trademark a number.

The successors are the Pentium Pro and Pentium II.

The following Pentium variants all belong to "x86 Family 6", as reported by "Microsoft Windows" when identifying the CPU:

Model

Name 1





Pentium Pro 2





? 3





Pentium II 4





? 5, 6

Celeron or Pentium II 7





Pentium III 8





Celeron uPGA2 or Mobile Pentium III

A floating-point division bug (ftp://ftp.isi.edu/pub/carlton/pentium/FAQ) was discovered in October 1994.

[Internal implementation, "Microprocessor Report" newsletter, 1993-03-29, volume 7, number 4].

[Pentium based computers, PC Magazine, 1994-01-25].



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PEIPA
PEM
PENCIL
pencil and paper
penis war
586
686
Accelerated Graphics Port
Artemis microkernel
ATX
Pentium 2
Pentium 3
Pentium II
Pentium III
Pentium II Xeon


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