MSI MS-5191 Manual page 43

Description of the item on screen are as follows:
USB Function
Set this option to Enable or Disable the on-chip USB controller.
The Optional and Fail-Safe default setting is Enabled.
USB Keyboard Legacy Support
Set this option to Enable or Disable USB keyboard/mouse.
The Optional and Fail-Safe default settings are Disabled.
DRAM Timing
Choose DRAM timing for customize setup.
SDRAM CAS Latency
This option determines the CAS latency time parameter of SDRAM.
The settings are 2 clks or 3 clks.
SDRAM Burst X-1-1-1-1-1-1-1
During Enabled, this will improve the SDRAM module burst
function. Some SDRAM module doesn't support this function, so this must
be set to Disabled.
Graphics Aperture Size
This option determines the effective size of the graphics aperture
used in the particular configuration. The AGP aperture is memory-mapped,
while graphics data structure can reside in a graphics aperture. The aperture
range should be programmed as non cacheable in the processor cache,
access with the aperture range are forwarded to the main memory, then
translated to the original issued address via a translation table that is
maintained on the main memory. The option allows the selection of an
aperture size of 4MB, 8MB, 16MB, 32MB, 64MB, 128MB, and 256MB.
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