dual channel or fully buffered. u talking about two different things.
rams are either fully buffered, or not. the workstation/server mobo uses the buffered rams. so u have to get buffered rams for that. u have no option.
dual channel, single channel. AFAIK, u can run buffered rams in dual channel as well as single channel. just make sure that u put equal rams with same speed/size in the right place.
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