Specifications

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Q. I have a VIA chipset based motherboard and I can't get AGP working or I get lockups in
Windows 2000. How can I fix it?
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There is a new viaagp.sys driver from Microsoft that may fix lockups in Windows 2000. You can get
more information and download the driver at the following website:
http://support.microsoft.com/support/kb/articles/Q261/6/06.asp
Be warned, however, that installing the AGP component of any VIA 4in1 driver on top of this update
will stop it working, as the 4in1 drivers use a file called viaagp1.sys instead. You can tell which driver
you are using because the Microsoft driver will be called 'Via Tech CPU to AGP Controller' and the VIA
driver will be called 'Via CPU to AGP Controller'.
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There is a solution for the AGP disabled problem for the VIA KX133 chipset available at the following
website:
http://www.tomshardware.com/mainboard/00q2/000417/kx133-04.html
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Q. I have a VIA chipset based motherboard and I can't get AGP2X or AGP4X wosking. How
can I fix it?
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Make sure that you installed the VIA AGP driver in 'Turbo' mode - otherwise you will be restricted to
AGP1X only.
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Make sure that you have AGP2X or AGP4X enabled in the BIOS of your motherboard.
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If you have an ASUS A7V motherboard, the 1004 series of BIOS updates seem to disable AGP4X. Try
1003a or the 1005+ series to enable AGP4X.
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Make sure that you have the latest (leaked) reference drivers installed.
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In addition, make sure you read the 'How can I enable AGP4X in the Detonator 5.16+ driver sets on my
VIA 133mhz chipset motherboard?' question.
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Q. I have a VIA chipset based motherboard and I can't get AGP4X to work without causing
instability. How can I fix it?
To enable AGP4X on VIA chipset based motherboards, see the 'How can I enable AGP4X in the Detonator
5.16+ driver sets on my VIA 133mhz chipset motherboard?' question. However, note that AGP4X is disabled
on these motherboards because of issues with AGP4X, VIA chipsets and the GeForce2, so these steps may not
work for everyone.
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The following instructions were provided by Gary Shapiro:
1. Check your BIOS setup, usually in the Chipset Features Setup, for something called the AGP
Driving Value. This value controls the timing of the AGP driver in Windows. The value you place
here can make AGP4X stable. This value is a hex value from 00-FF.
2. In order to place a value here you might need to change another BIOS setup feature called the
AGP Driving Control. This should appear with the AGP Driving Value. Set this to MANUAL if not
already. The other option is AUTO.
3. Try setting this value to DA or EA. Try DA for a VIA Apollo Pro 133A motherboard. On a KT133
motherboard you might want to try E7.
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