VIA Technologies P4XB-S User Manual page 49

RAS to CAS
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 lower the timing numbers, the faster the memory performance. Set-
ting options: 3T, 2T, Auto.
Burst Length
This setting allows you to set the size for Burst-Length for DRAM. The
bigger the sizes, the faster the system addresses memory. Setting options:
4, 8, Auto.
DRAM Command Rate
This setting controls the DRAM command rate. Selecting 1T allows DRAM
signal controller to run at 1T (T=clock cycles) rate. Selecting 2T makes
DRAM signal controller run at 2T rate. 1T is faster than 2T. Setting options:
2T, 1T.
AGP & P2P Bridge Control
Press <Enter> to enter the sub-menu and the following screen appears:
AGP 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
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BIOS Setup