Thanks again fewiDepends on your configuration. For just routing without any QoS or firewall rules the data sheet contains the official test data, it's available on routerboard.com. Any QoS rule or firewall rule means that the router spends time not routing, affecting throughput performance.
rb1000u act as bw-test server and the other as bw-test client. how big the different is?Did you push those packets through the router, or did you have the router generate or directly receive the packets used for the bandwidth test? There's a huge performance difference between the two.