Being an ATI only partner, it's important for Sapphire to have a large array of variations when it comes to their model line-up. Split into four categories, we have our standard reference models from them. Moving up a notch to the Vapor-X line, you get a nice upgraded cooler, but the same reference clocks.
After the Vapor-X you've got the TOXIC variants which are what we have today. They're essentially an overclocked Vapor-X model, so you get the upgraded cooler, but also an upgrade in clock speeds.