Pentium III

Pentium III

General information
Launched	February 28, 1999
Discontinued	April 23, 2004 (for desktop units) May 18, 2007 (for mobile units)[1]
Marketed by	Intel
Designed by	Intel
Common manufacturer	Intel
Product code	Katmai: 80525 Coppermine: 80526 Coppermine T: 80533 Tualatin: 80530
Performance
Max. CPU clock rate	400 MHz to 1.4 GHz
FSB speeds	100 MT/s to 133 MT/s
Cache
L1 cache	32 KB (16 KB data + 16 KB instructions)
L2 cache	128–512 KB
Architecture and classification
Technology node	250 nm to 130 nm
Microarchitecture	P6
Instruction set	IA-32
Extensions	MMX, SSE
Physical specifications
Transistors	Katmai: 9.5 million Coppermine: 28 million Tualatin: 47 million
Cores	1
Sockets	Slot 1 Socket 370 Socket 495 (mobile) Socket 479 (mobile)
Products, models, variants
Core names	Katmai (desktop only) Coppermine Coppermine T (desktop only) Tualatin
Variant	Celeron
History
Predecessor	Pentium II
Successor	Pentium 4
Support status
Unsupported

The Pentium III^[2] (marketed as Intel Pentium III Processor, informally PIII or P3) brand refers to Intel's 32-bit x86 desktop and mobile CPUs based on the sixth-generation P6 microarchitecture introduced on February 28, 1999.^{[citation needed]} The brand's initial processors were very similar to the earlier Pentium II-branded processors. The most notable differences were the addition of the Streaming SIMD Extensions (SSE) instruction set (to accelerate floating point and parallel calculations), and the introduction of a controversial serial number embedded in the chip during manufacturing.

Even after the release of the Pentium 4 in late 2000, the Pentium III continued to be produced with new models introduced up until early 2003. They were then discontinued in April 2004 for desktop units^[3] and May 2007 for mobile units.^[1]