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].
