MSI 745 ULTRA User Guide - Page 56

Row Precharge Time, RAS to CAS Delay, AGP Aperture Size

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AMI BIOS Setup cycles, the faster the DRAM performance. Settings: 6T and 5T. Row Precharge Time This setting controls the number of cycles for Row Address Strobe (RAS) to be allowed 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. Setting options: 2 T, 3 T. RAS to CAS Delay 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. Setting options: 3 T, 2 T. AGP Aperture Size The field selects the size of the Accelerated Graphics Port (AGP) aperture. Aperture is a portion of the PCI memory address range dedicated for graphics memory address space. Host cycles that hit the aperture range are forwarded to the AGP without any translation. Settings: 4MB, 8MB, 16MB, 32MB, 64MB, 128MB. AGP Mode The item sets an appropriate mode for the installed AGP card. Settings are: 1x, 2x, 4x. Select 4x only if your AGP card can support it. 3-13

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AMI BIOS Setup
3-13
cycles, the faster the DRAM performance.
Settings:
6T
and
5T
.
Row Precharge Time
This setting controls the number of cycles for Row Address Strobe (RAS) to
be allowed to precharge. If insufficient time is allowed for the RAS to accumu-
late 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. Setting options:
2 T
,
3 T
.
RAS to CAS Delay
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. Setting options:
3 T
,
2 T
.
AGP Aperture Size
The field selects the size of the Accelerated Graphics Port (AGP) aperture.
Aperture is a portion of the PCI memory address range dedicated for graphics
memory address space. Host cycles that hit the aperture range are forwarded
to the AGP without any translation. Settings:
4MB
,
8MB
,
16MB
,
32MB
,
64MB
,
128MB
.
AGP
Mode
The item sets an appropriate mode for the installed AGP card.
Settings are:
1x,
2x, 4x.
Select 4x only if your AGP card can support it.