Nokia 5.1 has a single channel 3GB RAM. The RAM frequency is 933 MHz.
Nokia 5.1 has a 3GB LPDDR3 type RAM. It is a single channel.
Yes, Nokia 5.1 does have the fingerprint sensor. It is located on the back panel of the phone.
Yes, Nokia 5.1 does have the gyro sensor.
Yes, Nokia 5. 1 does support OTG.