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Processor	Rating	@	Overclocked speed	Front Side Bus	X	Multiplier	Voltage	Upgraded from	Rating	Stable?	Survey entries
IBM / CYRIX
Cyrix / IBM 686	150	@	200/ 190ish	75	X	2	VARIES 3-3.3	Intel Pentium	100	YES (note 3)	1
Cyrix / IBM 686	150	@	200 / 190	75	X	2.5	2.8	Cyrix / IBM 686	150	YES	1
Cyrix / IBM 686	150	@	200	66	X	3.5 (1.5)	3,5	Cyrix / IBM 686	150	YES	1
Cyrix / IBM M2	150	@	166 (PR233)	83	X	2	2.9	Cyrix / IBM M2	PR200	YES	1
Cyrix / IBM 686	200	@	166	75	X	2	2.9	Intel Pentium	100	NO	1
Cyrix / IBM M2	200	@	262.5(PR333?)	75	X	3.5 (1.5)	3.2	Cyrix / IBM 686	300	YES	1
Cyrix / IBM M2	233	@	300	75	X	3.5 (1.5)	3.2	Intel Pentium	166	YES	1
Cyrix / IBM M2	266	@	210	60	X	3.5 (1.5)	2.9	Cyrix / IBM 686	200	YES (note 2)	1
Cyrix / IBM M2	300	@	PR450	83	X	3.5 (1.5)	3.3	Intel Pentium MMX,	166	YES	1
Cyrix / IBM M2	PR333	@	262.5(PR333)	75	X	3.5 (1.5)	2.9	Intel Pentium MMX,	200	YES (Note 1)	1

Note 1 - " This MII-333 is the "2.9V 75 MHz 3.5x" type. Once we managed to keep it cool enough, it was stable."

note 2 - "I am using CyrixM2PR300.　core2.9V I buy it 3500 Japanese yen. 60x3.5 is stable. 60x3 is stable. 66x3.5 is unstable 66x3 is also unstable 75x3.5 unstable 75x3.5 unstable My M/B seem to be unstable over 66Mhz bus clock. "

Note 3 - " i fried a cyrix m2 300!* set bus 83 multipied3.5=300ish the above configuration was rock solid ,but experiments overclocking have steadily pushed up volts this £2 chip is on the way out...fair success at 83 buss 3x multiplier benchmarked 225+ 75 mhz pentium fairly stable 1.5x/75 aprox. 120"

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