CPU Type		Year Relased	Clock Speed	Front-side bus
Intel	8088	1978	4.77 MHZ	N/A same
	8086	1978	5, 8, and 10 MHZ	N/A same
	286	1982	8, 10, and 12 MHZ	N/A same
	386	1985	16 to 40mhz	N/A, 8MHZ for some IO
	486	1989	16 to 100 MHZ	?? not faster then 40MHZ
	Pentium	1993	60 to 233 MHZ	60 or 66 MHZ
	Pentium Pro	1995	150, 166, 180, 200, and 233 MHZ	60 or 66 MHZ
	Pentium 2	1997	233 to 533 MHZ	66 or 100 MHZ
	Pentium 3	1999	450 MHZ upto 1.3GHZ	100 or 133 MHZ
	Pentium 4	2000	1.3GHZ upto 3.3GHZ	533 and 877 MHZ