You may consider a mainboard with PCIe (and PCIe NICs) and/or a 
mainboard with onboard NICs connected via PCIe instead of PCI.
The Supermicro PDSME for example.

Greetings
Carsten Holbach

Tarun Kundhi schrieb:
> If I drop back to a P4 630 3.0 GHz 2MB cache (LGA775) that should 
> resolve the dual core issues. That may be eaiser than looking for a 
> tweaked build.
>
> Any thoughts or concern about the Intel 82573 onboard gigabit controler?
>
> Thanks,
>
> t.