A64 and Dual Channel DDR

I may be completely mixed up about this but do the AMD 64's not support dual channel memory? If they dont how much of a difference in performance does it make? Cause it wouldnt be fun to have 1.5 gigs turned into the equivalent of 768MB of Dual Channel DDR 400
Thanks in advance,
Koka

Current Spec: AMD Athlon XP2000+, GeForce4 MX440, 256MB DDR, aOpen Mobo.
Specs By End OF November: AMD Athlon64 3200+, Asus X800XT, 1536MB DDR400, Asus A8N-E-Deluxe

Not having dual channel wont result in your memory being equal to half of what it is in dual channel. All it means is its theoretical bandwidth is cut in half, but with the AMD Athlon 64 architecture the difference in performance is neglible. You can thank that to an efficient memory controller.

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oh, its a nice day. TO EAT CHILDREN!!!

Well, the difference on a s939 board would still be between 7 and 10%. It is hard to ignore, so, when you get the A8N-E board, it would be good to make use of the dual channel.