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this is a question that you should be speaking to HP about. They will have detailed specs about the motherboard and will be able to give all the answers (hopfully) aobut it.
On the intel website, you can find some references to mixed steppings but it is always dependant on the motherboards.
As it happens, our reseller has been in touch with their dealer and with HP direct, but neither have been very forth comming with information.
I will see if I can find out anything myself.