Hi,i just saw this link Run QSFP28 100G Port in 40Gbps, 4x 10GbE, and 4x 25GbE Modes | FS Community I knew you could achive 4x25Gb or 4x10Gb but i was sure we can't use QSFP+ tranceiver for having 40Gb but te FS thread seems to say we can...If i read it correctly, we can do :- Use a QSFP28 transceiver (or DAC) for 100G connectivity (you use 4x lanes at 25G)- Use a QSFP+ transceiver (or DAC) for 40G connectivity (you use 4x lanes at 10G)- Use a QSFP+ transceiver (or DAC) for 4x 10G connectivity with a breakout cable to 4x SFP+ at the other side- Use a QSFP28 transceiver (or DAC) for 4x 25G connectivity with a breakout cable to 4x SFP25 at the other sideDo you have experienced a 40G connectivity on a 100G port ? on which brands ?I have 4 machines using 40G NIC and i would be able to upgrade my switch keeping theses NICs for a while...PS: i'm studying new Mikrotik switchs, someone have 40G experiences on with Mikrotik switches ?Best regards,Sébastien.