As the use of computers grew, so did the demand for CPU's. Intel
wanted to serve the processor power demand of user better and devided
the computer market into three sectors. The budget PC market, the mass
marked & mid-level PC's and the high end workstations & servers.
For each of the market sectors Intel designed processors tailord to what
Intel thought were the markets needs. The result was the Celeron for the
budget PC's, the Pentium II for the mass market & mid level PC's and
finally the Xeon for the high end workstations & servers. Here you
will find a description of the Pentium II and the mobile Pentium II. For
the Celeron please look here and for the Xeon here.
The first version of the Pentium II was launched in May 1997 at
the speeds of 233, 266 and 300MHz. It had the codename Klamath and version
number A80522. The Pentium II was in essence a combination of the Pentium
Pro and the Pentium MMX.
Intel used the P6 core of the Pentium Pro, increased the level 1 cache
from 16KB to 32KB and added MMX from the Pentium MMX. On top of that,
512KB level 2 cache was added et voilá, the next generation of
desktop processors was born. The FSB still ran at 66MHz and the core was
manufactured at 0.28µ.
Unfortunately for Intel, technologydid not allow for the integration of
the level 2 cache on the P6 core so they came up with the following solution.
The Pentium II core and external cache chip running at half the core speed
werre mounted on a Single Edged Contact Cartridge which could be mounted
on the motherboard through the new Slot1 motherboard interface.
The 233MHz version was badly overpriced when it was introduced,
the Pentium MMX 233MHz had about the same performance on a good Socket7
motherboard but the combination cost a lot less. But if you wanted a faster
CPU than 233MHz, then there was no other choice than a Pentium II.
In January 1998 Intel introduced a new version of the Pentium II,
codename Deschutes and versionnumber A80523. The Deschutes' core was manufactured
at 0.25µ and as a result the voltage could be lowered from the Klamath's
2.8v to 2.0v. The speed of the core could be increased up to 450MHz, which
was the fastest Pentium II to be released by Intel in August 1998.
Also new was the increase of the FSB speed from 66 to 100MHz for the 350,
450 and 450MHz Pentium II's which gave the processor a nice perfomance
boost. So also the introduction of PC100 RAM can be attributed to the
As with every Intel processor generation, the Pentium II got its
own mobile version, the Tonga. It was released in 1998 and manufactured
at 0.25µ. Speeds ranged from 233MHz to 366MHz. The mobile version
of the Pentium II was available in three packages; the Mobile Module Connector
1, MMC 2 and Mini Cartridge Connector. The mobile version of the Pentium
MMX used less power than the mobile Pentium II but it was only available
up to 266MHz.
The Pentium II brought CPU speeds up to 450MHz and busspeeds up
to 100MHz. It was able to run in dual configurations and many servers
ran on two Pentiums II's instead of the vastly more costly Xeons. Combined
with the BX chipset and enough RAM the Pentium II was a solid performer
in games and office applications.
Available models :
Pentium II 233MHz (80522, Klamath), 3.5 x 66MHz
Pentium II 266MHz (80522, Klamath), 4.0 x 66MHz
Pentium II 300MHz (80522, Klamath), 4.5 x 66MHz
Pentium II 266MHz (80523, Deschutes), 4.0 x 66MHz
Pentium II 300MHz (80523, Deschutes), 4.5 x 66MHz
Pentium II 333MHz (80523, Deschutes), 5.0 x 66MHz
Pentium II 350MHz (80523, Deschutes), 3.5 x 100MHz
Pentium II 400MHz (80523, Deschutes), 4.0 x 100MHz
Pentium II 450MHz (80523, Deschutes), 4.5 x 100MHz
Intel Pentium II Pictures