RAID 10 is terrible slow with 8x4TB WD Red drives: Read 170 MB/s Write 160 MB/s   With RAID 0, 8x4TB: Read 120 MB/s Write 170 MB/s   Iperf3 9,9 Gbit/s.   I have jumbo frames enabled.   Local source and target drive is a NVMe. Test file is 20 GB.   Can it be the Core i3-4130? Hmmm, I have no idea.