User's Manual
18
B. AGP & P2P Bridge Control
AGP Aperture Size
This function determines the amount of system memory that is given to the AGP
card. Options range from 4MB to 128MB. This is a dynamic memory allotment
in that the AGP card will only use the amount of memory that it needs. The
remaining memory not in use will be available for the system to use. For example,
if 16MB is alloted to the AGP card and the card only needs 8MB, the remaining
8MB will be available for system use.
AGP Mode
Enable this setting to utilize the4X mode (twice as fast as2X) offered by advanced
AGP cards. Your VGA card must support 4X mode in order to take advantage
of the faster speed.
C. CPU & PCI Bus Control
PCI1/PCI2 Master 0 WS Write
When Enabled, writes to the PCI bus are executed with zero wait states.
PCI Delay Transaction
The chipset has an embedded 32-bit posted write buffer to support delay
transactions cycles. Select Enabled to support compliance with PCI specification
version 2.1.
D. Memory Hole
Enabling this function will reserve the memory address space between 15MB and
16MB for ISA expansion cards. However, enabling this function will result in
not allowing the system to have access to memory above 16MB. Please note
that some expansion cards require this setting to be enabled. The default setting
is Disabled. If Auto Configuration is enabled, you must set the DRAM timing
function to 60ns or 70ns, depending on the type of DRAM you install.
E. System BIOS Cacheable
Enabling this function allows caching of the system BIOS ROM at F0000h-FFFFFh,
resulting in better system performance. However, if any program writes to this
memory area, a system error may result. Caching the system BIOS results in better
performance than shadowing the system BIOS as discussed in Section 3-2.