How to upgrade RAM in your PC CORSAIRWhile purchasing a RAM stick, ratings are like 16 GB RAM can be 1X16GB(1 DIMM and 16 GB RAM each), 2X8GB(2 DIMM and 8 GB RAM each) or 4X4GB(4 DIMM and 4 GB RAM each). Operating frequency and maximum overclocking frequency should also be taken into consideration. Advantages of DIMM Slots