While it is possible that some 8X cards will work in your 4X motherboard, I would not recommend it. You should just stick with a 4X card if you know your PC has a 4X slot. If it isn't matched up perfectly, you could damage your card and/or board.
count me in..... id be glad to help.. .Toxic: when i get the card i might need some help some help on disabling the video. I tried it on my last computer when i upgraded the video but never got it so it kept that ram dedicated to the video i wasnt using.
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im pretty sure that the AGP 4x thing means you can use any video card that is compatible with AGP 4xVideo Output
* Graphics processor
* SiS 651
* Video output form factor
* Integrated
* Video output interface type
* AGP 4x
* Video output type
* Graphics adapter