Cool, looks like you are running yours already in production - or are you still testing the setup?
Regarding the 3 GBit/s maximum - well this might be due to the fact that your NIC has two ports. Assuming that the observed 800 MB/s when running a single NVMe card in x4 mode is the maximum you can get from this SoC atm, this would support this theory since
2 * 3 GBit/s = 6 GBit/s =~ 750 MB/s
Personally, I rather need a setup with 3-4 one GBit/s links. Therefore, the rockpro64 seems to be a good match for that. But apart from the speed, the power consumption is not that satisfactory for me when compared to x86_64 alternatives like the APU series that are more or less on the same level.
Regarding the 3 GBit/s maximum - well this might be due to the fact that your NIC has two ports. Assuming that the observed 800 MB/s when running a single NVMe card in x4 mode is the maximum you can get from this SoC atm, this would support this theory since
2 * 3 GBit/s = 6 GBit/s =~ 750 MB/s
Personally, I rather need a setup with 3-4 one GBit/s links. Therefore, the rockpro64 seems to be a good match for that. But apart from the speed, the power consumption is not that satisfactory for me when compared to x86_64 alternatives like the APU series that are more or less on the same level.