For those who are interested.
Have you ever thought what maximum throughput you can get from small R7B50 (not G) 400mhz single core router with 32MB of RAM? I was thinking that 100Mbits is the limit due to port and switch connection to the CPU (I assumed it is connected by 100Mbit FD internally). Maybe almost 200Mbits as the port 1 has its own link to cpu and own IRQ. But not more. Take in account that RB750 costs around 20USD second hand.
So I did a quick test. Took couple of RB750s (part of my lab counting sometimes up to 6-7 different devices), connected them by 4 wires directly and one indirectly thru another router to be able to manage them. By this wire I run EOIP tunnel to get the fifth ethernet in between. Then bonding was set on all those five links.
I internally run udp bandwidth test (sure, I know, do not run the test on devices you are testing…
), sending from one RB750 packets trhu bonding interface to the second RB750. And guess what I got!
I would not believe it if I were not see it on my own eyes. For those that would not believe it like me, here is the picture:

I am sure that having faster traffic generator on the opposite side (not another RB750), it could be almost 500Mbits (unfortunatelly there are no more ports). Maybe i could spend some time finetunig the bonding and so, but even this is really impressive so I had to share with all of you.
Hope you enjoyed it like me.