Two Intel Xeon Dual Core processors.

Question is will XP see all four processors? I am getting all messed up trying to work this one out. As far as I know XP only supports two processors however as these are two processors with two cores in each will this not mean that effectively it is four processors and XP will only show two?

Or am I completely off at a tangent?

Have done the usual Google but nothing concrete to hang a hat on.

TIA,

emr