Nokia 5.1 has a single channel 3GB RAM. The RAM frequency is 933 MHz.
Yes, Nokia 5.1 is made of Aluminium metal.
Nokia 5.1 has an ARM Mali T-860 MP2 GPU. It is a dual core GPU and GPU frequency is 700 MHz.
Yes, Nokia 5.1 does have the fingerprint sensor. It is located on the back panel of the phone.