Well, virtually all Chipsets are supported now. You get graphics drivers for all, though you may face problems with Via Graphics (they are not unusable but drivers arent that good and lack 3D support).
And most Modems too have drivers. Though some cheap ones wont have support. I dont think that you will face problems though.
A good internet connection will be a must for a good Linux Experience as you'll need to download loads of stuff (the reason that preventing me from using it. )
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