Example:
[1650 GDDR5]
*Data Rate (Gbps/pin) = Clock Frequency (MHz) × 4
8 Gbps/pin = 2000 MHz X 4
*Bandwidth (GB/s) = (Data Rate per Pin (Gbps/pin) × Memory Bus Width (bit))/ 8 (bits/Byte)
128 GB/s = 8 Gbps/pin X 128 bit/8 bits/Byte

Example:
[4060 GDDR6]
*Data Rate (Gbps/pin) = Clock Frequency (MHz) × 8
17 Gbps/pin = 2125 MHz X 8
*Bandwidth (GB/s) = (Data Rate per Pin (Gbps/pin) × Memory Bus Width (bit))/ 8 (bits/Byte)
272 GB/s = 17 Gbps/pin X 128 bit/8 bits/Byte
