When adding RAM to a modern machine where do you obtain information regarding the right stick or sticks for the particular motherboard?

To find the right RAM sticks for a modern motherboard, you should consult the motherboard's user manual or specifications on the manufacturer's website, which typically provide details on compatible RAM types, speeds, and maximum capacity. Additionally, you can use online tools like PC Part Picker or manufacturer-specific compatibility checkers that allow you to input your motherboard model and get recommendations for compatible RAM. It's also helpful to check forums or communities for insights from other users with the same setup.