Abit NV7M, Руководство пользователя

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Introducing the BIOS
User’s Manual
3-9
You can use the arrow keys to move between the items. Use
PgUP
,
PgDn
,
+
or
-
key to change the values.
When you have finished setting up the chipset, press ESC to go back to the main menu.
Note
The parameters in this screen are for system designers, service personnel, and technically competent
users only. Do not reset these values unless you understand the consequences of your changes.
AGP Aperture Size:
Five options are available: 32MB
!
64MB
!
128MB
!
256MB
!
512MB
!
Back to 32MB. The
default setting is 64MB . This option specifies the amount of system memory that can be used by the AGP
device. The aperture is a portion of the PCI memory address range dedicated for graphics memory
address space. Host cycles that hit the aperture range are forwarded to the AGP without any translation.
See
http://www.agpforum.org for AGP information.
Frame Buffer Size:
Four options are available: 8MB
!
16MB
!
32MB
!
Disabled
!
Back to 8MB. The default setting is
32MB . This item can let you select the frame buffer memory size for onboard VGA accelerator.
Memory Timings:
Two options are available: Aggressive
!
Optimal. The default setting is Optimal . Choose Aggressive for
better memory performance, choose Optimal for better memory compability.
CAS Latency Override:
Three options are available: 2 Clocks
!
2.5 Clocks
!
Auto. The default setting is 2.5 Clocks . You can
select SDRAM CAS (
C
olumn
A
ddress
S
trobe) latency time according your SDRAM specification.
Clock Spread Spectrum:
Four options are available: 0.50%
!
1.00%
!
2.00%
!
Disabled, the default setting is Disabled . For
EMC ( E lectro- M agnetic C ompatibility Test) testing you may need to adjust these options for optimal
results, we do not recommend you change the default, except for special reasons. Some values you select
may cause system instability under some situations, please be careful.
CPU/MEM/AGP’s Freq:
Four options are available: 100/100/66
!
100/133/66
!
133/100/66
!
133/133/66. The default setting
is 100/100/66 . This item lets you set the processor F ront S ide B us, DDR SDRAM and AGP clock. It
correlates with the processor FSB clock you set. Many of options are available, you can choose the
frequency ratio you want. The default setting is
100/100/66 . In this case, the processor clock will be the
100 MHz. Memory clock will be the 100 MHz. The AGP clock will be the 66 MHz.