"Motherboard" is to the body,"CPU" is to the brain,"memory" size is to the the desk,"HDD" can be compared to a desk drawer.
"Memory" is used for temporary storage of information processing tasks.Memory (desk) Larger capacity (for wide,) raise the working efficiency, the faster your computer works.However, if the CPU can cause the PC to work late, even if you add more memory, the PC will not slow work of improvement.