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Intel 8088
Intel 8086
Intel 286
Intel 386
Intel 486
Intel Pentium
Intel Pentium II
Intel Pentium III
Intel Pentium IV
Intel Itanium
Motorola 6800
Zilog Z80
Intel celeron is the lowest processor Intel offers. Below is the list from best to worst:
Intel core i7
Intel core i5
Intel core 2 quad
Intel core 2 duo
Intel core 2 solo
Intel pentium
Intel celeron
For laptops:
Intel core 2 extreme
Intel centrino
Intel
Intel core
INTEL