Actually, no. There are no Dell computers with AMD CPUs inside.
Dell recently bought Alienware, which has been shipping AMD chips in some systems, but those were existing product lines and do not carry the "Dell" brand.
Then why was Apple the last big vendor to announce Yonah, and why does Apple *still* not have a Woody when everyone else does? (
http://www.supermicro.com/products/nfo/woodcrest.cfm)
Until there's evidence of Intel favoring Apple over its other customers, any "Apple is special" talk is fanboi fantasy.