Every Dual CPU motherboard I have worked with required both CPU's to be the same Speed...
Would be like trying to run Dual channel RAM at with Chips that are two different speeds..
Most motherboards even request CPU's from the same 'batch' so they are not differnet revisions etc.. for best perfromance.
I'm not going to say it won't work, because I have never actually tried it, but it could cause some wierd problems.
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