Abit SE6 User Manual page 23

BIOS Setup
®
Pentium III and Celeron
300 (66)
500 (66)
600 (66)
667 (133)
800 (133)
User Define
The wrong settings of the multiplier and external clock in certain circumstances may cause CPU
damage. Setting the working frequency higher than the PCI chipset or processor specs, may cause
abnormal memory module functioning, system hangs, hard disk drive data lose, abnormal functioning
of the VGA card, or abnormal functioning with other add-on cards. Using non-specification settings
for your CPU is not the intention of this explanation. These should be used for engineering testing, not
for normal applications.
If you use non-specification settings for normal operation, your system may not be stable, and may
effect system reliability. Also, we do not guarantee the stability and compatibility for settings that are
not within specification, and any damage of any elements on the motherboard or peripherals, is not
our responsibility.
External Clock:
After choosing the "CPU Operating Speed" option as "Use Define", you can choose the figure of
external clock from 50~250MHz.
Note: The CPU bus speed above 66MHz/100MHz/133MHz is supported but not guaranteed due to the
PCI and chipset limitation.
FSB Rate (CPU:SDRAM:PCI):
You can choose the ratio among 2:3:1 ) 3:3:1 ) 4:3:1 ) 4:4:1 (within the range of external clock
from 50~96MHz), or 3:3:1 ) 4:3:1 ) 4:4:1 (within the range of external clock from 97~140MHz), or
4:3:1 ) 4:4:1 (within the range of external clock from 140~250MHz).
Take the external clock of 66MHz for example:
If you choose the FSB ratio of 2:3:1, the figure of CPU:SDRAM:PCI will be all divided by 2, that is:
CPU = 66 x 2/2 = 66MHz, SDRAM = 66 x 3/2 = 100MHz, PCI = 66 x 1/2 = 33MHz.
And if you choose the FSB ratio of 4:3:1, the figure of CPU:SDRAM:PCI will be all divided by 4, that is:
CPU = 66 x 4/4 = 66MHz, SDRAM = 66 x 3/4 = 50MHz, PCI = 66 x 1/4 = 17MHz.
Note: An improper setting might cause the system unstable or even fail, please proceed with care.
Multiplier Factor:
You can choose from the following multiplier factors: 2.0 ) 2.5 ) 3.0 ) 3.5 ) 4.0 ) 4.5 ) 5.0 )
5.5 ) 6.0 ) 6.5 ) 7.0 ) 7.5 ) 8.0 ) 8.5 ) 9.0 ) 9.5 ) 10.0 ) 10.5 ) 11.0 ) 11.5 ) 12.0 (The
Coppermine CPU does not support the multiplier factors of 2.0 and 2.5)
Note: According to Celeron
will have the multiplier factor locked and the signal disabled. In this situation, there is no way to
choose a higher multiplier factor.
™
MMX processors, you can choose the following settings:
333 (66) 366 (66)
500 (100) 533 (66)
600 (100) 600 (133)
700 (66) 700 (100)
850 (100) 866 (133)
&&&& &&&& &&&& &&&&
™
PPGA MMX processor types, some Celeron
400 (66)
533 (133)
633 (66)
733 (133)
933 (133)
&&&& &&&& &&&& &&&&
Warning
433 (66) 466(66)
550 (100) 566 (66)
650 (100) 667 (66)
750 (100) 800 (100)
1G User Define
™
PPGA MMX processors
User's Manual
3-3