User Guide

4-18 Chapter 4: BIOS Setup
SDRAM Mode [Normal]
This item allows you to select the SDRAM RAS to CAS Delay Time (T
RCD
)
and the SDRAM RAS Precharge Time (T
RP
) for 4T when the DRAM
frequency is greater than 166MHz. The setting [Safe] forces T
RCD
and T
RP
to equal to 4T. [Normal] is equal to the setting [By SPD] or as user defined.
Configuration options: [Normal] [Safe]
SDRAM Command Timing Control [2T]
This item allows you to select [1T] for better DRAM performance, or [2T]
for a more reliable DRAM access. It is recommended that you select [2T]
when two DDR DIMMs are installed. Configuration options: [2T] [1T]
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 or 2X 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 2X/4X card. When
set to [2X Mode], the AGP interface provides a peak data trhoughput of
only 533MB/s even if you are using an AGP 4X card.
Configuration options: [1X Mode] [2X 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]
The SDRAM RAS Precharge Time parameter appears only when you
set the SDRAM Configuration to [User Defined].
SDRAM RAS Precharge Time [3T]
This item controls the idle clocks after issuing a precharge command to
the SDRAM.