Abit SG-72 User Manual page 45

BIOS Setup
RAS Active Time (tRAS)
This item allows you to set the amount of time a RAS can be kept open for multiple accesses. High
figures will improve performance.
RAS Precharge Time (tRP)
This is the duration of the time interval during which the Row Address Strobe signal to a DRAM is held
low during normal Read and Write Cycles. This is the minimum interval between completing one read or
write and starting another from the same (non-page mode) DRAM. Techniques such as memory
interleaving, or use of Page Mode DRAM are often used to avoid this delay. Some chipsets require this
parameter in order to set up the memory configuration properly. The RAS Precharge value is typically
about the same as the RAM Access (data read/write) time.
RAS to CAS Delay (tRCD)
This is the amount of time a CAS is performed after a RAS. The lower the better, but some DRAM does
not support low figures.
Back to Advanced Chipset Features Setup Menu:
AGP & P2P Bridge Control:
Click <Enter> key to enter its submenu:
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 address range dedicated to graphics memory address space. Host
cycles that hit the aperture range are forwarded to the AGP without any translation.
Graphic Window WR Combin:
This item determines whether the graphic windows base address is valid or not.
AGP Fast Write Support:
This item enables and disables AGP Fast Write Support.
AGP Data Rate Capability:
This item allows you to control AGP card data transfer rate.
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User's Manual