Table 3.13. Cyrix P-Ratings Versus Actual Chip Speeds in MHz

CPU Type

P-Rating

Actual CPU Speed (MHz)

Clock Multiplier

Motherboard Speed (MHz)

6x86

PR90

80

2x

40

6x86

PR120

100

2x

50

6x86

PR133

110

2x

55

6x86

PR150

120

2x

60

6x86

PR166

133

2x

66

6x86

PR200

150

2x

75

6x86MX

PR133

100

2x

50

6x86MX

PR133

110

2x

55

6x86MX

PR150

120

2x

60

6x86MX

PR150

125

2.5x

50

6x86MX

PR166

133

2x

66

6x86MX

PR166

137.5

2.5x

55

6x86MX

PR166

150

3x

50

6x86MX

PR166

150

2.5x

60

6x86MX

PR200

150

2x

75

6x86MX

PR200

165

3x

55

6x86MX

PR200

166

2.5x

66

6x86MX

PR200

180

3x

60

6x86MX

PR233

166

2x

83

6x86MX

PR233

187.5

2.5x

75

6x86MX

PR233

200

3x

66

6x86MX

PR266

207.5

2.5x

83

6x86MX

PR266

225

3x

75

6x86MX

PR266

233

3.5x

66

M-II

PR300

225

3x

75

M-II

PR300

233

3.5x

66

M-II

PR333

250

3x

83

M-II

PR366

250

2.5x

100

M-II

PR400

285

3x

95

M-II

PR433

300

3x

100

Cyrix III

PR433

350

3.5x

100

Cyrix III

PR466

366

3x

122

Cyrix III

PR500

400

3x

133

Cyrix III

PR533

433

3.5x

124

Cyrix III

PR533

450

4.5x

100