All NIC's on the Qumulex Gateways are autosensing. If you have plugged them into either a 100Mb or a 1000Mb port on your switch, it should detect and configure automatically.
Sometimes we have found if you have a bad port, or a bad cable, the system may dial a 1000Mb connection down to 100Mb. If you think you have plugged it into a proper port, try swapping out the cable. If it still persists, try using a different known working port on the switch.
One of the above two things should get you to the connection proper connection speed.