RTL8125 Speed between revisions

I’ve been troubleshooting all manner of things trying to get each of my three Rock 5B’s to get as much out of the 2.5Gb NICs. Of the 3 boards, lspci reports its rt8125 device as “Rev 04” and the other two as “Rev 05”. The “Rev 04” version gets consistently better (~2.35Gb/s) throughput in iperf tests than the other two (~1.8Gb/s).

Anyone had this experience?