Memory

The types of memory are
-DRAM (its the memory that has to be refreshed)
-SRAM (used for cache)
-SDRAM (Synced with the CPU 168pin)
-DDR (Data raising and falling edge 184pin)
-DDR2 (Like DDR but 240pin)
-Single Ranked DDR (single slot)
-Double Ranked DDR (double slot)