It is ATX 12V v2.01 compliant and, therefore, fully supports 24 pin boards. Here is a link to the mfrs<A HREF="http://www.maxpoint.com/home/products/pow_supp/spec_pg/whisper2_2_0/index.htm" target="_new">specs</A>. Take a look at the pics of the connectors. There is a detachable 4-pin so the PSU can support either 20p or 24p mobos, but it is not an adapter.
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<font color=red>You're a boil on the arse of progress - don't make me squeeze you!</font color=red>