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Solved! I've found the problem: I think there is a config issue on default Intel QNAP TCP config (factory default): Default Receive TCP Window on Intel QNAP = net.ipv4.tcp_rmem = "4096 1638400 1638400" Default Receive TCP Window on ARM QNAP = net.ipv4.tcp_rmem="32768 87380 16777216" I think Intel's config had a too low minimal window As soon as I changed the value on the Intel to the values on the ARM, ssh data transfer went double and beyond So I tweaked the TCP Windows (send and receive), and got my beloved 1Gbps per job code (ssh root on QNAP ) sysctl -w net.ipv4.tcp_rmem="131072 524288 16777216" sysctl -w net.ipv4.tcp_wmem="131072 524288 16777216" Also, I think it's active on default, but not a bad idea forcing autotuning: sysctl -w net.ipv4.tcp_window_scaling=1 I hope it's useful If anyone has the same issue. Just be sure to include the tweaks on autorun.sh to survive reboots Thanks