I am getting "low" transfer rates between an internal samsung 970 evo+ and an external WD My Passport Ultra. The external drive is connected to the rear USB 3.1 (usb-c) port. The cable is USB-C to USB-C. I am getting no more than 120mbps when transferring between the drives. I get the same speed using a four year old usb 3 HDD through the front panel ports.
BIOS - up to date
xCHI- enabled
Better performance - enabled
external HDD drivers - up to date
BIOS - up to date
xCHI- enabled
Better performance - enabled
external HDD drivers - up to date