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
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].