Asus P4B-LX - Manual (Page 68)

4-18 Chapter 4: BIOS Setup
SDRAM Idle Timer [Infinite]
Configuration options: [Infinite] [0T] [8T] [16T] [64T]
Graphics Aperture Size [64MB]
This feature allows you to select the size of mapped memory for AGP
graphic data. Configuration options: [4MB] [8MB] [16MB] [32MB] [64MB]
[128MB] [256MB]
AGP Capability [4X Mode]
This motherboard supports the AGP 4X interface that transfers video data
at 1066MB/s. AGP 4X is backward-compatible, so you may keep the
default [4X Mode] even if you are using an AGP 1X video card. When set
to [1X Mode], the AGP interface only provides a peak data throughput of
266MB/s even if you are using an AGP 4x card.
Configuration options: [1X Mode] [4X Mode]
Video Memory Cache Mode [UC]
USWC (uncacheable, speculative write combining) is a new cache
technology for the video memory of the processor. It can greatly improve
the display speed by caching the display data. You must set this to UC
(uncacheable) if your display card does not support this feature, otherwise
the system may not boot. Configuration options: [UC] [USWC]
Memory Hole At 15M-16M [Disabled]
This field allows you to reserve an address space for ISA expansion cards.
Setting the address space to a particular setting makes that memory
space unavailable to other system components. Expansion cards can only
access memory up to 16MB. Configuration options: [Disabled] [Enabled]
The SDRAM RAS Precharge Delay parameter appears only when you
set the SDRAM Configuration to [User Defined].
SDRAM RAS Precharge Delay [3T]
This item controls the idle clocks after issuing a precharge command to
the SDRAM.
SDRAM Active Precharge Delay [6T]
This item controls the number os SDRAM clocks used for SDRAM
parameters.
The SDRAM Active Precharge Delay parameter appears only when
you set the SDRAM Configuration to [User Defined].