It has something to do with architecture as well. When they overhauled it, getting rid of pipelines and switching to the Streaming Processors / Unified Shaders you have today, it was driver hell. Going from G92 (8800GT>S 512, 9000 series) to GT200 cores likewise caused issues because of an overhaul (I honestly wouldn't recommend a GTX2xx card to anyone).
I'm guessing the launch of Fermi is going to be mayhem as well, though it seems to me like the GTX series is a testbed for their upcoming releases, or perhaps merely something to bridge the gap between the 9000 series and Fermi.
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