The RAM must be suitable for the motherboard. There are currently three types of RAM available: SDRAM, DDR SDRAM and RDRAM. The motherboard's chipset determines which type of RAM may be used. You will find the specification on the motherboard's box or in the motherboard manual.

Installing RAM. A notch at the bottom of the memory module ensures that the RAM is fitted correctly. The notch is located in different places on SDRAM, DDR SDRAM and RDRAM.

DIMM memory modules have a notch underneath that lines up with a key on the memory slots. Although it is not possible to insert the modules the wrong way, you should line up the RAM with its slot before installing it. Then, carefully press the module into the slot. Caution is recommended, as too much pressure may damage certain tracks on the motherboard. It is best to push one side down first, and then the other. The notch will snap into its key as soon as one side is seated correctly. To make sure it is seated correctly, you can always take the memory module out again. Releasing the clips will pop the module out of its socket. Then, you can just lift it out.

Passed the first hurdle. Motherboard with processor, cooler and memory.