I purchased this adapter for a Sony S380 notebook, and I can't seem to get throughput speeds over 200 Mbps. Connecting a Dell optiplex GX380 with the same cable, to the same port, receives speeds of 500-600 Mbps. Both systems run Win XP SP2, and all wiring is CAT6 with an HP Procurve 2848 switch. Any suggestions, or has anyone else had problems with this card not producing the speeds it should? I have not been able to find 1 Review on this card either, maybe because it is too new.