I have two identical boxes. Each have a built in VIA Rhine II and a pci Realtek 8139. When doing bandwidth tests between them, I am just getting about 84/5Mbps on the VIA and mid 70's on the Realteks. I am testing using udp packets with iperf v. 1.7.0. We have several other of these boxes that get in the mid 90's. Any suggestions on what to check?