A64 4000+ san diego or a A64 X2 3800+?

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Planning on upgrading to an Asus A8N-SLi nforce4 motherboard and can't
decide if to get a A64 4000+ san diego or A64 X2 3800+ processor my main
concern though is does this board support X2 processors as I can see Asus
have a premium edtion to this board which is supposed to support X2 but no
mention on the deluxe edition.
What would the performance differences between the processors be? is it
worth considering a motherboard that supports X2?
TIA for any help.

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