It is a CPU socket that is used by processors from AMD. It was first introduced in 2009 and is compatible with processors such as the Phenom II, Athlon II, and Sempron. When looking for the best Socket AM3 or AM3+ Socket motherboard, there are a few things to consider. Firstly, the motherboard should support the processor you want to use. Secondly, the motherboard should have the necessary features and expansion options that you need. Thirdly, the AM3 Socket motherboard should be compatible with the memory and storage that you plan to use. When you order AM3+Socket motherboard, it is important to check for processor compatibility, features, expansion options, memory and storage compatibility, and warranty and return policy.