How to make difference between DDR1,DDR2 ,DDR3 and DDR4

DDR stands for Double Data rate.There are various difference between DDR1,DDR2,DDR3 &DDR4

DDR1:-

Its has 184 pin.
Its Clock Speed is 400-800 MHz or 3200 Mbps.
It notches  at 2.85"
It Operate at 1.8 volt.

DDR2:-

Its has 240 pin.
Its Clock Speed is 800-1600 MHz or 6400 Mbps.
It notches  at 2.48"
It Operate at 1.5 volt.

DDR3:-

Its has also 240 pin.
Its Clock Speed is 1600-3200 MHz or 32000 Mbps.
It notches  at 2.15"
It also Operate at 1.5 volt.

DDR4:-

Its has also 288 pin for Desktop/Server & 260 pin for Laptop SODIMMs
Its Clock Speed is 1700-3400 MHz or 32000 Mbps.
It also Operate at 1.2 volt.