MSI KT880 User Guide - Page 46

BIOS Setup, REF to ACT / REF to REF Trfc

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BIOS Setup to precharge. If insufficient time is allowed for the RAS to accumulate its charge before DRAM refresh, refresh may be incomplete and DRAM may fail to retain data. This item applies only when synchronous DRAM is installed in the system. Available settings: [6T], [7T], [8T], [9T]. Active to CMD (Trcd) When DRAM is refreshed, both rows and columns are addressed separately. This setup item allows you to determine the timing of the transition from RAS (row address strobe) to CAS (column address strobe). The less the clock cycles, the faster the DRAM performance. Settings: [2T], [3T], [4T], [5T]. REF to ACT / REF to REF (Trfc) This setting determines the time RFC takes to read from and write to a memory cell. Setting options: [12T], [13T], [14T], [15T]. DRAM Command Rate This setting controls the DRAM command rate. Select [1T Command] allows DRAM singlal controller to run at 1T (T=clock cycles) rate. Select [2T Command] makes DRAM siganl controller run at 2T rate. [1T] is faster than [2T]. Setting options: [1T Command], [2T Command]. VLink 8X Supported This item enables or disables the 8X VLink Data Rate. Setting options: [Enabled], [Disabled]. AGP Mode The item sets an appropriate mode for the installed AGP card. Setting options: [AGP 4x], [AGP 8x]. AGP Fast Write This option enables or disables the AGP Fast Write feature. The Fast Write technology allows the CPU to write directly to the graphics card without passing anything through the system memory and improves the AGP 4X speed. Select [Enabled] only when the installed AGP card supports this function. Settings: [Enabled], [Disabled]. Graphics Aperture Size This setting controls just how much system RAM can be allocated to AGP for video purposes. The aperture is a portion of the PCI memory address range dedicated to graphics memory address space. Host cycles that hit the aperture range are forwarded to the AGP without any translation. The option allows the selection of an aperture size of [4MB], [8MB], [16MB], [32MB], [64MB], [128MB], and [256 MB]. AGP Master 1 W/S Read When [Enabled] is selected, one wait state is inserted in the AGP read cycle. Setting options: [Enabled], [Disabled]. AGP Master 1 W/S Write When [Enabled] is selected , writes to the AGP bus are executed with one wait state inserted. Setting options: [Enabled], [Disabled]. 3-11

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3-11
BIOS Setup
to precharge. If insufficient time is allowed for the RAS to accumulate its charge
before DRAM refresh, refresh may be incomplete and DRAM may fail to retain data.
This item applies only when synchronous DRAM is installed in the system. Available
settings: [6T], [7T], [8T], [9T].
Active to CMD (Trcd)
When DRAM is refreshed, both rows and columns are addressed separately. This
setup item allows you to determine the timing of the transition from RAS (row address
strobe) to CAS (column address strobe).
The less the clock cycles, the faster the
DRAM performance. Settings: [2T], [3T], [4T], [5T].
REF to ACT / REF to REF (Trfc)
This setting determines the time RFC takes to read from and write to a memory cell.
Setting options: [12T], [13T], [14T], [15T].
DRAM Command Rate
This setting controls the DRAM command rate. Select [1T Command] allows DRAM
singlal controller to run at 1T (T=clock cycles) rate. Select [2T Command] makes
DRAM siganl controller run at 2T rate. [1T] is faster than [2T]. Setting options: [1T
Command], [2T Command].
VLink 8X Supported
This item enables or disables the 8X VLink Data Rate. Setting options: [Enabled],
[Disabled].
AGP Mode
The item sets an appropriate mode for the installed AGP card.
Setting options: [AGP
4x], [AGP 8x].
AGP Fast Write
This option enables or disables the AGP Fast Write feature. The Fast Write technol-
ogy allows the CPU to write directly to the graphics card without passing anything
through the system memory and improves the AGP 4X speed. Select [Enabled] only
when the installed AGP card supports this function. Settings: [Enabled], [Disabled].
Graphics Aperture Size
This setting controls just how much system RAM can be allocated to AGP for video
purposes. The aperture is a portion of the PCI memory address range dedicated to
graphics memory address space. Host cycles that hit the aperture range are for-
warded to the AGP without any translation. The option allows the selection of an
aperture size of [4MB], [8MB], [16MB], [32MB], [64MB], [128MB], and [256 MB].
AGP Master 1 W/S Read
When [Enabled]
is selected, one wait state is inserted in the AGP read cycle. Setting
options: [Enabled], [Disabled].
AGP Master 1 W/S Write
When [Enabled] is selected
, writes to the AGP bus are executed with one wait state
inserted. Setting options: [Enabled], [Disabled].