Cuular: Not all dual Opteron boards, in fact, only the Tyan out of the three I've mentioned (H8DCE, K8WE, K8N-DL) has PCI-X. They may however, route NIC and SATA(PATA as well?) through PCIe, which should have much the same effect. But then again, isn't your DFI an Nforce 4 board, which should...