RAM banks are distinguished by number--which should you use first?

As mentioned in Tip 74, many current motherboards support dual-channel memory architecture in which RAM slots work in pairs. An additional hitch: On motherboards with four memory slots, these pairs are sometimes labeled "memory bank 1 and 2" or "memory bank A and B," with each label indicating one of the pairs. Whatever the case, if you're not using all of the slots, always use the lowest-numbered or -lettered bank first.