Pentium II
Story
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The Pentium II incorporated a cache memory that was divided into two levels called L1 and L2, which gave it greater performance. All these processors had built-in MMX commands and were manufactured with two different bus speeds, 66 MHz and 100 MHz.
From here Intel began to give its models technical names such as "Klamath", "Deshutes", and so on.
The world of motherboards was also revolutionized with the appearance of the socket called "Slot 1", which unlike the previous sockets that were installed horizontally, this one was made vertically.
This gave rise to a new type of specifications in the boxes where these computers were mounted, thus the ATX specification was born (until now the AT specification was used).
The ATX boxes achieved better ventilation for these processors, as well as a much more logical distribution of the components than that used up to now.
SOCKET
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Slot 1
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Slot 1 was a radical change in processor and motherboard design.
For the first time a processor was inserted vertically, instead of horizontally as was done until then.
This change gave rise to the birth of the ATX format in the boxes, since the processor needed more ventilation and therefore all the components of the motherboard were relocated again.
This new format resulted in Intel's direct competition, AMD, also making an effort to manufacture its own vertical format.
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Slot 1 was used on the following processors:
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- Intel Pentium II
- Intel Celeron
- Intel Petium III
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Pentium II



Intel Pentium II 233
80522PX233512
TYPE: Pentium II Klamath
Velocity: 233MHz
Bus: 66MHz
Watch: X3.5
L1 cache: 16KB + 16KB
L2 cache: 512KB
Number of transistors: 7,500,000
Package: SECC
Socket: Slot 1
sSpec: SL2HD
Voltage: 2.8V
Manufacturing: 5 / 1997
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Intel Pentium II 266
80522PX266512
TYPE: Pentium II Klamath
Velocity: 266MHz
Bus: 66MHz
Watch: X4
L1 cache: 16KB + 16KB
L2 cache: 512KB
Number of transistors: 7,500,000
Package: SECC
Socket: Slot 1
sSpec: SL2HE
Voltage: 2.8V
Manufacturing: 12 / 1997
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Intel Pentium II 300 with heatsink
80523P300512E
TYPE: Pentium II Deshutes
Velocity: 300MHz
Bus: 66MHz
Watch: X4.5
L1 cache: 16KB + 16KB
L2 cache: 512KB
Number of transistors: 7,500,000
Package: SECC
Socket: Slot 1
sSpec: SL2YK
Voltage: 2.8V
Manufacturing: 1997
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Intel Pentium II 350
80522PX350512
TYPE: Pentium II Deshutes
Velocity: 350MHz
Bus: 100MHz
Watch: x3
L1 cache: 16KB + 16KB
L2 cache: 512KB
Number of transistors: 7,500,000
Package: SECC
Socket: Slot 1
sSpec: SL356
Voltage: 2.8V
Manufacturing: 4 / 1998
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