NVMe performance degradation RHEL 7.2 to 7.3

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Simple read tests show a significant performance degradation on RHEL 7.3

RHEL/CentOS 7.2

dd if=/dev/nvme0n1 of=/dev/null bs=256k iflag=direct
102020939776 bytes (102 GB) copied, 47,6167 s, 2,1 GB/s

RHEL/CentOS 7.3

dd if=/dev/nvme0n1 of=/dev/null bs=256k iflag=direct
204656082944 bytes (205 GB) copied, 162,362 s, 1,3 GB/s

System

Supermicro X10DRH
NVMe: Intel P3700 400GB PCIe card

The Intel P3700 400GB NVMe card should be capable of 2,7 GB/s reads and 1,2 GB/s writes - what can I do to reach the limits of the hardware ?

GH

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