Types of RAM
There are different types of RAM that are used in computer systems, each having its own features and uses.
Memory types include:
30-pin SIMM (Single In-line Memory Module)
168-pin DIMM (Dual In-line Memory Module)
The text descriptions refer to the different physical packaging of memory chips. This packaging is the placement of individual memory chips on a printed circuit board (PCB) which is designed to be easily inserted or connected to the motherboard.
Within each of the types there are different speeds, capacities and architecture. This means that even although a memory module could fit into a memory slot on the motherboard it may not work and that reference should be made to the motherboard documentation when installing new memory.