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Speed
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Usual Operating System
USB Ports
Pentium 1

Upto 200 MHz
Windows 3.1, Windows 95 No USB
Pentium 2

Upto 400 MHz
Windows 95 Windows 98 Usually 1 USB
Pentium 3
450 MHz
Upto
1.4 GHz
Windows 98 Second Edition
NT Workstation
Windows 2000 Professional		 Usually 2 USB Ports
Pentium 4
Upto
3.2 GHz

Windows 2000 Professional
Windows XP, Home and Professional

Usually 2-6 USB ports
Firewire 1394
Celeron
Below 600 MHz
Windows 95 Windows 98 Usually 1 USB Port
600 MHz to 3 GHz

Windows 98 Second Edition
NT Workstation
Windows 2000 Professional
XP Home and Professional

 Anywhere from 2 to 6 USB Ports.
       
AMD
Similar to Pentium 1 & 2
AMD