Dual mode (with both U.2 and U.3 interfaces) NVMe drives may not work without PCIe reset signal. Reset signal is necessary for U.2 connection but not U.3 connection, so Broadcom and Areca x8 SFF-8654 to x8 U.3 SFF-8639 connection cable do not send reset signal.They can only support U3 only not support dual mode (with both U.2 and U.3 interfaces) NVMe drives; such as Micron 7540 U.3.