VIA Technologies P4XB-S User Manual page 50

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Chapter 3
address range dedicated to graphics memory address space. Host cycles
that hit the aperture range are forwarded to the AGP without any translation.
Setting options: 4MB, 8MB, 16MB, 32MB, 64MB, 128MB, and 256MB.
AGP Driving Control
The setting is used to adjust AGP driving force. Selecting Manual allows
you to type a AGP driving force in AGP Driving Value. It is strongly
suggested to select Auto to avoid causing any system error. Setting
options: Auto, Manual.
AGP Fast Write
This setting enables/disables the AGP Fast Write feature. The Fast Write
technology allows CPU to write directly into the graphics card without
passing anything through system memory and improves 4X speed
accordingly. Select Enabled only when your AGP card supports the feature.
Setting options: Enabled, Disabled.
CPU & PCI Bus Control
Press <Enter> to enter the sub-menu and the following screen appears:
CPU to PCI Write Buffer
When Enabled, CPU can write up to four words of data to the PCI write
buffer before CPU must wait for PCI bus cycle to finish. If Disabled, CPU
must wait after each write cycle until PCI bus signals that it is ready to
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