Hi, I tried these things already. When I enable hardware CRC offloading, disable TSO and Receive buffer offloading (3 boxes , I tried all combinations) I get slightly different rates but all slower and unstable results in iperf3 with rates like 500-600mbps. When all boxes are ticked I get a stable 720mbps which is the max for this device. Regarding powerd: I tried HiAdaptive, and Max and I tried disabling it. Powerd has no effect at the throughput at all, CPU usage remains very low. Regarding the EEE in sysctl , when I toggle them, I lose connection to the firewall and the only way to restore it is power cycling the box. Current setting is default EEE=1. I really need to double check the client side again and fetch a machine to test against the firewall. What other things can I try? And can you test one of these boxes with iperf3 ? The problem could just be with these boards. I read some of the Qotoms with similar specs have the same data rate issues , getting no more than 80MBps Would be great if you have the time to test it in your lab and let us know Any other suggestion is welcome