I have tried in the past retrograding newer hardware back to XP (mostly while Vista was making everything go backwards), and from my own personal experience with several different chipsets, the results aren't usually that great. By that great I mean buses or system devices simply not being recognised and weird happenings from the system locking up completely when trying to go into sleep mode to neat things like the soundcard/audio devices being totally unrecognised.
Sneakily enough later 'lite' versions of Windows XP like the netbook versions for Dell, HP etc had additional drivers which cover alot more newer chipsets/devices, so it is not that the devices are incompatible, just the Microsoft is trying to force you to upgrade your OS when you purchase new hardware. A kind of planned obsolescence similar to the automotive industry.
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