SDRAM, sometimes used for DDR2 SDRAM
:* 200-pin: DDR SDRAM and DDR2 SDRAM
:* 204-pin: DDR3 SDRAM
:* 260-pin: DDR4 SDRAM
:* 260-pin: UniDIMMs carrying either DDR3 or DDR4 SDRAM; differently notched than DDR4 SO-DIMMs
:* 262-pin: DDR5 SDRAM;MiniDIMM
:* 244-pin: DDR2 SDRAM;MicroDIMM
:* 144-pin: SDRAM
:* 172-pin: DDR SDRAM
:* 214-pin: DDR2 SDRAM

Besides pin count there are also physical notches