User`s guide

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Chapter 3: BIOS Setup Utility
• CAS Latency Time (2): This item controls the timing delay (in clock
cycles) before the DRAM starts a read command after receiving it.
• Active to Precharge Delay (8): This precharge time is the number of
cycles it takes for DRAM to accumulate its charge before refresh.
• DRAM RAS# to CAS# Delay (4): This field lets you insert a timing
delay between the CAS and RAS strobe signals, used when DRAM is
written to, read from, or refreshed. Disabled gives faster performance;
and Enabled gives more stable performance.
• DRAM RAS# Precharge (4): Select the number of CPU clocks
allocated forthe Row Address Strobe (RAS#) signal to accumulate its
charge before the DRAM is refreshed. If insufficient time is allowed,
refresh may be incomplete and data lost.
Memory Frequency For (Auto)
This item sets the main memory frequency. When you used an external graphics
card, you can adjust this to enable the best performance for your system.
System BIOS Cacheable (Disabled)
When this item is enabled, the System BIOS will be cached for faster execution.
Video BIOS Cacheable (Enabled)
When this is enabled, the Video RAM will be cached resulting to better perfor-
mance. However, if any program was written to this memory area, this may
result to system error.
AGP Aperture Size (MB) (128)
This item defines the size of the aperture if you use an AGP graphics adapter.
The AGP aperture refers to a section of the PCI memory address renge used for
graphics memory. We recommend that you leave this item at the default value.
Init Display First (PCI Slot)
This item allows you to choose the primary display card.
Fast Chip Select (Auto)
This item allows you to read the Data transfer from CPU to GMCH.
CPC Addr/Control (Auto)
This item allows you to increase the performance when DDR400 DIMM is
installed and set this item to “Enabled”. However, this might cause the system to
become UNSTEADY.
Turbo Mode (Auto)
This item allows you to increase the performance of CPU L2 cache timing at
high speed.
On-Chip Frame Buffer Size (8MB)
This item allows you to set the onboard frame buffer size, ranging from 1MB,
8MB, to 16MB.