Each drive and the motherboard need to be hooked up to the power supply. Communication cables run from the motherboard or expansion cards to the drives. It is called random access because it is not sequential in nature like a cassette tape where you have to advance or reverse through songs to get to the one you want. It operates more like a CD disc where direct access to any song is possible. EDO RAM had been popular.
RAM continues to get faster, more efficient, and more reliable with emerging technology.
Ports Be sure to study section 3.15 carefully. Here is a summary. The combination of a monitor and video card is very important. One aspect of viewing at your desktop is screen resolution which relies upon the abilities of your monitor and video card. Screen resolution is important when viewing websites for example.