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| CPU | CPU clock | System clock | Clock ratio | JP65 |
| AMD 486 Enh. | 100 MHz | 33 MHz | 3 : 1 |
|
| AMD 486 Enh. | 120 MHz | 40 MHz | 3 : 1 |
|
| AMD 5x86 | 133 MHz | 33 MHz | 4 : 1 |
|
| Cyrix 5x86 | 100 MHz | 33 MHz | 3 : 1 |
|
| Cyrix 5x86 | 120 MHz | 40 MHz | 3 : 1 |
|
| Cyrix 5x86 | 133 MHz | 33 MHz | 4 : 1 |
|

AMD Am486 DX/DX2/DX4 (NV8T)
| CPU clock | System clock | Clock ratio | JP65 |
| 120 MHz | 40 MHz | 3 : 1 |
|
| 100 MHz | 33 MHz | 3 : 1 |
|
| 100 MHz | 50 MHz | 2 : 1 |
|
| 80 MHz | 25 MHz | 3 : 1 |
|
| 80 MHz | 40 MHz | 2 : 1 |
|

Cyrix Cx486S (M6)

Cyrix Cx486DX/DX2/DX4 (M7)

Intel 486DX/DX2 Non S-Series

Intel 486SX
UMC U5-S

Intel 486DX/DX2/DX4 S-Series
Intel DX4, only:
| CPU clock | System clock | Clock ratio | JP65 |
| 100 MHz | 33 MHz | 3 : 1 |
|
| 100 MHz | 50 MHz | 2 : 1 |
|
| 75 MHz | 25 MHz | 3 : 1 |
|
Intel 486SX S-Series
Intel P24D (486DX2 Write Back)
| Cache mode | JP59 |
| Write-Back |
|
| Write-Through |
|
Next Chapter: Systemclock
© 1999 Shuttle Inc., Last modification: 12/14/1999