Yes there is. Server platforms are connected to more storage, higher bandwidth networking and more exotic sockets (more than one CPU). It is one thing to support lots of PCI express lots on paper. It is another thing to have a working solution that doens't suffer degraded performance when all the PCI express slots are in use at the same time.

None of this is rocket science but it takes money and engineers time to make these things happen. Intel has more of both at the moment.