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ASUS CUSL2-C Black Pearl User’s Manual62
4. BIOS SETUP
4. BIOS SETUP
Chip Configuration
SDRAM RAS to CAS Delay
This controls the latency between the SDRAM active command and
the read/write command.
SDRAM RAS Precharge Time
This controls the idle clocks after issuing a precharge command to the
SDRAM.
SDRAM Cycle Time (Tras, Trc) [6T, 8T]
This feature controls the number of SDRAM clocks used for SDRAM pa-
rameters Tras and Trc. Tras specifies the minimum clocks required be-
tween active command and precharge command. Trc specifies the mini-
mum clocks required between active command and re-active command.
Configuration options: [5T, 7T] [6T, 8T]
SDRAM Page Closing Policy [One Bank]
This feature controls that after a page miss whether the Graphics and
Memory Controller Hub (GMCH) will issue “precharge only the bank” or
“precharge all” command to a specific opened SDRAM bank. Configura-
tion options: [One Bank] [All Banks]
CPU Latency Timer [Enabled]
This controls the GMCH’s response to CPU deferrable cycles. Configura-
tion options: [Disabled] [Enabled]
Command Per Cycle [Enabled] (only for Intel 815E Chipset)
When onboard VGA is used, CPU can help to gain graphics performance
by increasing proper SDRAM cycles combinations. Configuration options:
[Enabled] [Disabled]
Video Memory Cache Mode [UC]
USWC (uncacheable, speculative write combining) is a new cache tech-
nology 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 cannot support this feature; otherwise
your system may not boot. Configuration options: [UC] [USWC]
Graphics Window Size [64MB]
This feature allows you to select the size of mapped memory for AGP
graphic data. Configuration options: [64MB] [32MB]
AGP Capability [4X Mode]
This motherboard supports the AGP 4x interface, which transfers video
data at 1066MB/s. Since AGP 4x is backward-compatible, you may leave
this on the default setting of [4X Mode] even when you are using an AGP
2x video card. When set to [2X Mode], the AGP interface will only provide
a peak data throughput of 533MB/s even if you are using an AGP 4x card.
Configuration options: [2X Mode] [4X Mode]