This simply means that you must use
a 4x AGP card in the mobo. 4x AGP run at 1.5V and 2x use 3.3V which will fry
the board.
Here is an article that I posted to all clients of Pacpacific Australia
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Scorching Graphics performance...
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Owners of motherboards based on the i845 or i850 chipsets BEWARE! Installing
a graphics card into your beloved board that does not support 4x AGP will
render instant death to the onboard memory controller. The problem arises
when cards using 2x AGP (which run ar 3.3V) are wrongly keyed for 1.5V. This
makes it possible to insert certain 2x AGP cards into the AGP ports on i845
and i850 boards. But not recommended. When the power is switched on, the
increased voltage fries the 82845 memory controller hub. rendering the
motherboard useless. Some of the cards that will fry your shiny new Pentium
4 motherboard include:
* ALL SIS 305- and SIS 6326 based graphics cards
* Voodoo3 Graphics cards
* graphics cards using Savage4 Chips with revision numbers before 3.0 AND
* ALL NVIDIA Vanta Based cards
If you are unsure wheather your graphics card could potentially fry your
Pentium 4 Board, check the cards manual to see if it supports 4x AGP. If 4x
AGO isn't mentioned it would be best if you use a different graphics card,
or use it anyway and be up for $400 to buy another i845
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END ARTICLE
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