To my knowledge there is no color standardization for sata port speeds. More often than not there are multiple controller interfaces on a given motherboard and the colors differentiate between them. You will need to read up on your motherboard interfaces to figure out which is the best for your application. Typically the fastest your drive can support is the best for the application. Often you will also find a raid (Redunduant Array of Inexpensive Drive) controller on one of them. Depending on how you set it up it can enhance speed in a multiple drive setup, but if only using one drive it will do nothing for you. Depending on your level of expertise I often will avoid setting up a boot on a raid array. They can be finicky, especially when updating bios, and in the modern era of SSDs the bandwidth performance gain can often be mitigated by the latency they create. Also most consumer RAID can either mirror or stripe, but often not both at the same time.