440EX/LX AT
MAINBOARD
AWARD BIOS SETUP
4-7
registers. You may select either “60 ns” or “50 ns” according to the different DRAMs‘
which is installed on the board,. Basically, “50 ns” will let you have better
performance. However, “60ns” is recommended in most case causes it works with most
DRAM modules.
When “Auto Configuration” is “Enabled”, the “DRAM speed selection” field will be
disappeared and you may use the other fields to configure the DRAM speed. Basically,
it is not recommended unless you are the professional technician.
Memory Hole at 15M-16M : (
default setting : “Disabled” )
Some specific add-on cards may require a 1MB address space between 15MB and
16MB area. Please refer to the user’s manual of your add-on card carefully to see
whether you will have to enable this field or not when you are installing a add-on card
to the system..
AGP Aperture Size (MB) : (
default setting: 64MB )
There is the AGP slot on the board and which allows user to install the AGP display
card in the system. The AGP display card will use some of the system memory to store
3D texture mapping data so that the video performance can be increased tremendously.
You may use this field to define the memory size which you prefer to use with the
AGP card. The memory size selectable in this field can be 4MB to 256MB.
It seems that the default setting –64MB is huge. In fact, what is defined in the BIOS
selection is to tell the operation system the maximum memory can be shared by AGP
card to store the 3D texture mapping data. The larger aperture size will let you have the
better performance on 3D Video display.
There is the VGART.VXD utility comes with the AGP card and it will decide the actual
memory size which will be shared by AGP card. If you are installing the Windows 98
operating system, the feature are already supported by the OS and you can select the
memory for the AGP Aperture size.
CPU Host Clock : (
default setting : 66MHz )
This option is used to select the front side bus frequency (FSB). The selectable option
on this field will be 66MHz and 68MHz, Basically, 68MHz will give higher
performance to your PC system. However, the system may become unstable when
improper components are populated on the board.
When you have select the FSB frequency, please refer to section 3- 3 and use JP7-JP9
to decide the CPU clock.
