[Doohickey]

I don't know where you're buying stuff, but 2003 Enterprise is good for up to 8 CPUs, right out of the box.

[TechJunkYard]

.. 2003 Enterprise is good for up to 8 CPUs, right out of the box.

Supports them, sure. I am unable to find the MS doc I was looking at last night, which discusses per-CPU licensing.

But 2003 Enterprise is quite expensive, notwithstanding all of the other licenses (CALs, Exchange, TS, etc.) you'd need to actually do something with it. Much more pricey than the Red Hat solution.