I have a An AM2 on a Foxconn A74MK-X motherboard which has a Realtek RTL8169/8110 NIC in it. When I have it plugged into my 100Mb switch or set it to connect to my gigabit switch at 100mbps I get about 9MB/s transfers. When I connect it to my gigabit switch at gigabit speed I get about 400K/s transfers. All the activity lights on the switch flash on and off at the same time as well. It has worked before at gigabit speeds with this switch but I reinstalled WHS and can't figure out what's going on. Any ideas where I should look for the problem? I have jumbo frames off also.