Advanced Chipset Features Option

This option displays a table of items that define critical timing parameters of the System Board components including the memory, and the system logic. Generally, you should leave the items on this page at their default values unless you are very familiar with the technical specifications of your system hardware. If you change the values incorrectly you may introduce fatal errors or recurring instability into your system. Note that the page has a scroll-bar to scroll down to more items.

SDRAM CAS Latency Time

Default: 3

SDRAM Cycle Time Tras/Trc

Default: 6/8

SDRAM RAS-to-CAS Delay

Default: 3

SDRAM RAS Precharge Time

Default: 3

These four items set the timing and wait states for SDRAM memory. We recommend that you leave these items at the default value.

System BIOS Cacheable

Default: Enabled

Video BIOS Cacheable

Default: Enabled

These items allow the video and/or system to be cached in memory for faster execution. We recommend that you leave these items at the default value.

Memory Hole at 15M-16M

Default: Disabled

This item can be used to reserve memory space for some ISA expansion cards that require it.

CPU Latency Timer

Default: Disabled

This item sets a timing parameter for CPU access. Since the CPU timing is determined by the system hardware, leave this item at the default value.

Delayed Transaction

Default: Enabled

If the chipset has an embedded 32-bit write buffer to support delay transaction cycles, you can enable this item to provide compliance with PCI Ver. 2.1 specifications. We recommend that you leave this item at the default value.

On-Chip Video Window Size

Default: 64 MB

This item defines the size of the aperture if you use an AGP graphics adapter. It refers to a section of the PCI memory address range used for graphics memory. We recommend that you leave this item at the default value.

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IBM 2169 manual Advanced Chipset Features Option