Don't push the envelope with such a low-quality PSU, it could surprise you. True, its only 15 Watts, but what if you have walked say 340 feet from the parking lot to the Grand Canyon viewing rail. You want to get closer, with the logic that "Hey, I've already gone 340, what could 15 more do?" And then, your PSU dies, and it might take something with it. No offense meant, but messing around with the limits of something that temperamental. I checked it's manufacturers stat sheet and it does't have nearly the amount of safety blocks, it should, looks like short-circuit, over-voltage, over-wattage, and under-voltage is it. You'd be much better off with a higher quality power supply to begin with.